Directly initialize JwtHelperService in auth service

frontend/src/app/app.config.ts

@@ -1,29 +1,13 @@
-import {ApplicationConfig, importProvidersFrom, provideZoneChangeDetection} from '@angular/core';
+import {ApplicationConfig, provideZoneChangeDetection} from '@angular/core';
 import {provideRouter} from '@angular/router';
-import {JwtHelperService, JwtModule} from '@auth0/angular-jwt';
 import {CookieService} from 'ngx-cookie-service';
 
 import {routes} from './app.routes';
 
-export function jwtTokenGetter() {
-  return localStorage.getItem('jwt');
-}
-
 export const appConfig: ApplicationConfig = {
   providers: [
     provideZoneChangeDetection({eventCoalescing: true}),
     provideRouter(routes),
     CookieService,
-    {
-      provide: JwtHelperService,
-      useValue: new JwtHelperService()
-    },
-    importProvidersFrom(
-      JwtModule.forRoot({
-        config: {
-          tokenGetter: jwtTokenGetter
-        }
-      })
-    )
   ]
 };