- npm updates

- add favicon via template
- add popup.service.ts

src/app/app.module.ts

@@ -6,6 +6,7 @@ import { MapComponent } from './map/map.component';
 
 import { HttpClientModule, HttpClient } from '@angular/common/http'; //for http requests
 import { MarkerService } from './services/marker.service';
+import { PopupService } from './services/popup.service';
 import { DatasetApiService } from "./services/dataset-api.service";
 import { HttpService } from "./services/http.service";
 
@@ -25,7 +26,7 @@ import { HttpService } from "./services/http.service";
   // imports: Other modules whose exported classes are needed by component templates declared in this NgModule.
   imports: [BrowserModule, HttpClientModule],
   providers: [
-    MarkerService, HttpService, DatasetApiService,
+    MarkerService, PopupService, HttpService, DatasetApiService,
     // {
     //   provide: DatasetApiInterface,
     //   useClass: SplittedDataDatasetApiInterface,