Re-enable service worker

Frontend/src/main.ts

@@ -41,12 +41,10 @@ bootstrapApplication(AppComponent, {
         },
         provideAnimations(),
         provideHttpClient(withInterceptorsFromDi()),
-        /*
         provideServiceWorker('ngsw-worker.js', {
             enabled: !isDevMode(),
             registrationStrategy: 'registerWhenStable:30000'
         })
-        */
     ]
 })
     .catch(err => console.error(err));