Optimize js and css

docs/01_ko.html

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         <meta charset="UTF-8">
         <meta content="text/html;charset=utf-8" http-equiv="Content-Type">
         <meta content="utf-8" http-equiv="encoding">
-        <meta name="viewport" content="user-scalable=no, width=device-width, initial-scale=1, maximum-scale=1"
+        <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1">
         <meta name="keywords" content="Rust, Programming, Learning">
         <meta name="description" content="Rust tutorial website based on tour_of_rust">
         <meta name="theme-color" content="#ff6801"/>

docs/02_ko.html

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         <meta charset="UTF-8">
         <meta content="text/html;charset=utf-8" http-equiv="Content-Type">
         <meta content="utf-8" http-equiv="encoding">
-        <meta name="viewport" content="user-scalable=no, width=device-width, initial-scale=1, maximum-scale=1"
+        <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1">
         <meta name="keywords" content="Rust, Programming, Learning">
         <meta name="description" content="Rust tutorial website based on tour_of_rust">
         <meta name="theme-color" content="#ff6801"/>

docs/03_ko.html

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         <meta charset="UTF-8">
         <meta content="text/html;charset=utf-8" http-equiv="Content-Type">
         <meta content="utf-8" http-equiv="encoding">
-        <meta name="viewport" content="user-scalable=no, width=device-width, initial-scale=1, maximum-scale=1"
+        <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1">
         <meta name="keywords" content="Rust, Programming, Learning">
         <meta name="description" content="Rust tutorial website based on tour_of_rust">
         <meta name="theme-color" content="#ff6801"/>

docs/04_ko.html

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         <meta charset="UTF-8">
         <meta content="text/html;charset=utf-8" http-equiv="Content-Type">
         <meta content="utf-8" http-equiv="encoding">
-        <meta name="viewport" content="user-scalable=no, width=device-width, initial-scale=1, maximum-scale=1"
+        <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1">
         <meta name="keywords" content="Rust, Programming, Learning">
         <meta name="description" content="Rust tutorial website based on tour_of_rust">
         <meta name="theme-color" content="#ff6801"/>

docs/06_ko.html

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         <meta charset="UTF-8">
         <meta content="text/html;charset=utf-8" http-equiv="Content-Type">
         <meta content="utf-8" http-equiv="encoding">
-        <meta name="viewport" content="user-scalable=no, width=device-width, initial-scale=1, maximum-scale=1"
+        <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1">
         <meta name="keywords" content="Rust, Programming, Learning">
         <meta name="description" content="Rust tutorial website based on tour_of_rust">
         <meta name="theme-color" content="#ff6801"/>

docs/07_ko.html

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         <meta charset="UTF-8">
         <meta content="text/html;charset=utf-8" http-equiv="Content-Type">
         <meta content="utf-8" http-equiv="encoding">
-        <meta name="viewport" content="user-scalable=no, width=device-width, initial-scale=1, maximum-scale=1"
+        <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1">
         <meta name="keywords" content="Rust, Programming, Learning">
         <meta name="description" content="Rust tutorial website based on tour_of_rust">
         <meta name="theme-color" content="#ff6801"/>

docs/08_ko.html

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         <meta charset="UTF-8">
         <meta content="text/html;charset=utf-8" http-equiv="Content-Type">
         <meta content="utf-8" http-equiv="encoding">
-        <meta name="viewport" content="user-scalable=no, width=device-width, initial-scale=1, maximum-scale=1"
+        <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1">
         <meta name="keywords" content="Rust, Programming, Learning">
         <meta name="description" content="Rust tutorial website based on tour_of_rust">
         <meta name="theme-color" content="#ff6801"/>

docs/09_ko.html

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         <meta charset="UTF-8">
         <meta content="text/html;charset=utf-8" http-equiv="Content-Type">
         <meta content="utf-8" http-equiv="encoding">
-        <meta name="viewport" content="user-scalable=no, width=device-width, initial-scale=1, maximum-scale=1"
+        <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1">
         <meta name="keywords" content="Rust, Programming, Learning">
         <meta name="description" content="Rust tutorial website based on tour_of_rust">
         <meta name="theme-color" content="#ff6801"/>

docs/10_ko.html

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         <meta charset="UTF-8">
         <meta content="text/html;charset=utf-8" http-equiv="Content-Type">
         <meta content="utf-8" http-equiv="encoding">
-        <meta name="viewport" content="user-scalable=no, width=device-width, initial-scale=1, maximum-scale=1"
+        <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1">
         <meta name="keywords" content="Rust, Programming, Learning">
         <meta name="description" content="Rust tutorial website based on tour_of_rust">
         <meta name="theme-color" content="#ff6801"/>

docs/11_ko.html

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         <meta charset="UTF-8">
         <meta content="text/html;charset=utf-8" http-equiv="Content-Type">
         <meta content="utf-8" http-equiv="encoding">
-        <meta name="viewport" content="user-scalable=no, width=device-width, initial-scale=1, maximum-scale=1"
+        <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1">
         <meta name="keywords" content="Rust, Programming, Learning">
         <meta name="description" content="Rust tutorial website based on tour_of_rust">
         <meta name="theme-color" content="#ff6801"/>

docs/12_ko.html

@@ -6,7 +6,7 @@
         <meta charset="UTF-8">
         <meta content="text/html;charset=utf-8" http-equiv="Content-Type">
         <meta content="utf-8" http-equiv="encoding">
-        <meta name="viewport" content="user-scalable=no, width=device-width, initial-scale=1, maximum-scale=1"
+        <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1">
         <meta name="keywords" content="Rust, Programming, Learning">
         <meta name="description" content="Rust tutorial website based on tour_of_rust">
         <meta name="theme-color" content="#ff6801"/>

docs/13_ko.html

@@ -6,7 +6,7 @@
         <meta charset="UTF-8">
         <meta content="text/html;charset=utf-8" http-equiv="Content-Type">
         <meta content="utf-8" http-equiv="encoding">
-        <meta name="viewport" content="user-scalable=no, width=device-width, initial-scale=1, maximum-scale=1"
+        <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1">
         <meta name="keywords" content="Rust, Programming, Learning">
         <meta name="description" content="Rust tutorial website based on tour_of_rust">
         <meta name="theme-color" content="#ff6801"/>

docs/14_ko.html

@@ -6,7 +6,7 @@
         <meta charset="UTF-8">
         <meta content="text/html;charset=utf-8" http-equiv="Content-Type">
         <meta content="utf-8" http-equiv="encoding">
-        <meta name="viewport" content="user-scalable=no, width=device-width, initial-scale=1, maximum-scale=1"
+        <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1">
         <meta name="keywords" content="Rust, Programming, Learning">
         <meta name="description" content="Rust tutorial website based on tour_of_rust">
         <meta name="theme-color" content="#ff6801"/>

docs/15_ko.html

@@ -6,7 +6,7 @@
         <meta charset="UTF-8">
         <meta content="text/html;charset=utf-8" http-equiv="Content-Type">
         <meta content="utf-8" http-equiv="encoding">
-        <meta name="viewport" content="user-scalable=no, width=device-width, initial-scale=1, maximum-scale=1"
+        <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1">
         <meta name="keywords" content="Rust, Programming, Learning">
         <meta name="description" content="Rust tutorial website based on tour_of_rust">
         <meta name="theme-color" content="#ff6801"/>

docs/16_ko.html

@@ -6,7 +6,7 @@
         <meta charset="UTF-8">
         <meta content="text/html;charset=utf-8" http-equiv="Content-Type">
         <meta content="utf-8" http-equiv="encoding">
-        <meta name="viewport" content="user-scalable=no, width=device-width, initial-scale=1, maximum-scale=1"
+        <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1">
         <meta name="keywords" content="Rust, Programming, Learning">
         <meta name="description" content="Rust tutorial website based on tour_of_rust">
         <meta name="theme-color" content="#ff6801"/>

docs/17_ko.html

@@ -6,7 +6,7 @@
         <meta charset="UTF-8">
         <meta content="text/html;charset=utf-8" http-equiv="Content-Type">
         <meta content="utf-8" http-equiv="encoding">
-        <meta name="viewport" content="user-scalable=no, width=device-width, initial-scale=1, maximum-scale=1"
+        <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1">
         <meta name="keywords" content="Rust, Programming, Learning">
         <meta name="description" content="Rust tutorial website based on tour_of_rust">
         <meta name="theme-color" content="#ff6801"/>

docs/18_ko.html

@@ -6,7 +6,7 @@
         <meta charset="UTF-8">
         <meta content="text/html;charset=utf-8" http-equiv="Content-Type">
         <meta content="utf-8" http-equiv="encoding">
-        <meta name="viewport" content="user-scalable=no, width=device-width, initial-scale=1, maximum-scale=1"
+        <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1">
         <meta name="keywords" content="Rust, Programming, Learning">
         <meta name="description" content="Rust tutorial website based on tour_of_rust">
         <meta name="theme-color" content="#ff6801"/>

docs/19_ko.html

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         <meta charset="UTF-8">
         <meta content="text/html;charset=utf-8" http-equiv="Content-Type">
         <meta content="utf-8" http-equiv="encoding">
-        <meta name="viewport" content="user-scalable=no, width=device-width, initial-scale=1, maximum-scale=1"
+        <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1">
         <meta name="keywords" content="Rust, Programming, Learning">
         <meta name="description" content="Rust tutorial website based on tour_of_rust">
         <meta name="theme-color" content="#ff6801"/>

docs/21_ko.html

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         <meta charset="UTF-8">
         <meta content="text/html;charset=utf-8" http-equiv="Content-Type">
         <meta content="utf-8" http-equiv="encoding">
-        <meta name="viewport" content="user-scalable=no, width=device-width, initial-scale=1, maximum-scale=1"
+        <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1">
         <meta name="keywords" content="Rust, Programming, Learning">
         <meta name="description" content="Rust tutorial website based on tour_of_rust">
         <meta name="theme-color" content="#ff6801"/>

docs/22_ko.html

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         <meta charset="UTF-8">
         <meta content="text/html;charset=utf-8" http-equiv="Content-Type">
         <meta content="utf-8" http-equiv="encoding">
-        <meta name="viewport" content="user-scalable=no, width=device-width, initial-scale=1, maximum-scale=1"
+        <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1">
         <meta name="keywords" content="Rust, Programming, Learning">
         <meta name="description" content="Rust tutorial website based on tour_of_rust">
         <meta name="theme-color" content="#ff6801"/>