Network menu design updates.

frontend/src/app/app.module.ts

@@ -3,7 +3,7 @@ import { NgModule } from '@angular/core';
 import { HttpClientModule } from '@angular/common/http';
 import { ReactiveFormsModule } from '@angular/forms';
 import { BrowserAnimationsModule } from '@angular/platform-browser/animations';
-import { NgbButtonsModule, NgbTooltipModule, NgbPaginationModule } from '@ng-bootstrap/ng-bootstrap';
+import { NgbButtonsModule, NgbTooltipModule, NgbPaginationModule, NgbDropdownModule } from '@ng-bootstrap/ng-bootstrap';
 import { InfiniteScrollModule } from 'ngx-infinite-scroll';
 
 import { AppRoutingModule } from './app-routing.module';
@@ -81,6 +81,7 @@ import { SharedModule } from './shared/shared.module';
     NgbButtonsModule,
     NgbTooltipModule,
     NgbPaginationModule,
+    NgbDropdownModule,
     InfiniteScrollModule,
     SharedModule,
   ],