fix(ngrx-notification): compilation error

Due to upgrading to Angular 16,  `REDUCERS` were in the incorrect file and
should have been moved to `app.config.ts` from `main.ts`.

apps/ngrx-notification/src/app/app.config.ts

@@ -5,9 +5,23 @@ import { TeacherEffects } from './teacher/store/teacher.effects';
 import { StudentEffects } from './student/store/student.effects';
 import { provideRouter } from '@angular/router';
 import { ROUTES } from './routes';
-import { APP_INITIALIZER, enableProdMode, inject } from '@angular/core';
+import { APP_INITIALIZER, inject } from '@angular/core';
 import { FakeBackendService } from '@angular-challenges/ngrx-notification/backend';
 import { NotificationService } from './data-access/notification.service';
+import {
+  teacherReducer,
+  teachersFeatureKey,
+} from './teacher/store/teacher.reducer';
+import {
+  studentReducer,
+  studentsFeatureKey,
+} from './student/store/student.reducer';
+
+const REDUCERS = {
+  [teachersFeatureKey]: teacherReducer,
+  [studentsFeatureKey]: studentReducer,
+};
+
 export const appConfig: ApplicationConfig = {
   providers: [
     provideStore(REDUCERS),

apps/ngrx-notification/src/main.ts

@@ -1,29 +1,15 @@
 import { appConfig } from './app/app.config';
 
 import { bootstrapApplication } from '@angular/platform-browser';
+import { enableProdMode } from '@angular/core';
 
 import { AppComponent } from './app/app.component';
-
-import {
-  studentReducer,
-  studentsFeatureKey,
-} from './app/student/store/student.reducer';
-
-import {
-  teacherReducer,
-  teachersFeatureKey,
-} from './app/teacher/store/teacher.reducer';
 import { environment } from './environments/environment';
 
 if (environment.production) {
   enableProdMode();
 }
 
-const REDUCERS = {
-  [teachersFeatureKey]: teacherReducer,
-  [studentsFeatureKey]: studentReducer,
-};
-
 bootstrapApplication(AppComponent, appConfig).catch((err) =>
   console.error(err)
 );