feat: add router

src/pages/Header.js

 import React from 'react';
 import header_styles from './Header.module.css';
+import { useNavigate } from "react-router-dom";
+
 const Header=()=>{
+  const navigate = useNavigate();
+
+  const goToHome = () => {
+    navigate("/");
+  }
+
+  const goToSearch = () => {
+    navigate("/search");
+  }
+
+  const goToClientservice = () => {
+    navigate("/clientservice");
+  }
+
+  const goToMypage = () => {
+    navigate("/mypage");
+  }
+
   return (
     <header>
       <div className={header_styles.header_content}>
@@ -8,11 +28,11 @@ const Header=()=>{
         <div className={header_styles.header_logo}><a href="/"><img src="/planpuzzle_logo.png"></img></a></div>
         <nav className={header_styles.header_nav}>
           <ul>
-            <li><a href="/">홈</a></li>
-            <li><a href="/search">검색</a></li>
-            <li><a href="/clientservice">고객지원</a></li>
-            <li><a href="/mypage">마이페이지</a></li>
-            <li><a href="#logout"><img src="/logout_img.png"></img></a></li>
+            <li onClick={goToHome}><a>홈</a></li>
+            <li onClick={goToSearch}><a>검색</a></li>
+            <li onClick={goToClientservice}><a>고객지원</a></li>
+            <li onClick={goToMypage}><a>마이페이지</a></li>
+            <li><a><img src="/logout_img.png"></img></a></li>
           </ul>
         </nav>