Merge pull request #358 from woowacourse-teams/fix/#357

fix: serviceWorker의 register의 경로 수정

frontend/src/index.tsx

@@ -12,7 +12,7 @@ if (process.env.REACT_APP_GOOGLE_ANALYTICS) {
 
 if ('serviceWorker' in navigator) {
   navigator.serviceWorker
-    .register('/firebase-messaging-sw.js')
+    .register('./firebase-messaging-sw.js')
     .then((registration) => {
       console.log('Service Worker registered with scope:', registration.scope);
     })