[CHORE] 실행 포트 변경

react-whenMeet/package.json

@@ -19,7 +19,7 @@
     "web-vitals": "^2.1.4"
   },
   "scripts": {
-    "start": "react-scripts start",
+    "start": "export PORT=80 && react-scripts start",
     "build": "react-scripts build",
     "test": "react-scripts test",
     "eject": "react-scripts eject"