Router basename 수정 완료

client/src/App.js

@@ -10,7 +10,7 @@ import ErrorPage from "./pages/ErrorPage";
 
 function App() {
   return (
-    <Router basename={process.env.REACT_APP_ROUTE_URL}>
+    <Router basename={process.env.PUBLIC_URL}>
       <div id="box" className="container mx-sm-auto">
         <Switch>
           <Route exact path="/" component={LoginPage} />