feat: ScrollToTop 추가

src/Routers.js

@@ -7,10 +7,12 @@ import ChallengePage from "./pages/ChallengePage";
 import MyPage from "./pages/MyPage";
 import SettingPage from "./pages/SettingPage";
 import DiscussionPage from "./pages/DiscussionPage";
+import ScrollToTop from "./components/common/ScrollToTop";
 
 const Routers = () => {
   return (
     <BrowserRouter>
+      <ScrollToTop />
       <Routes>
         {/* 메인페이지 - 전체 글 목록 / 날짜별 챌린지 목록 */}
         <Route element={<MainPage />} path="/" exact />

src/components/common/ScrollToTop.jsx

@@ -0,0 +1,12 @@
+import { useEffect } from "react";
+import { useLocation } from "react-router-dom";
+
+export default function ScrollToTop() {
+  const { pathname } = useLocation();
+
+  useEffect(() => {
+    window.scrollTo(0, 0);
+  }, [pathname]);
+
+  return null;
+}