message: docs(Demo): add note as to why material imports are needed in the demo
diff: @@ -6,6 +6,7 @@ import 'hammerjs';
  import { FlexLayoutModule } from '@angular/flex-layout';
  import { HttpClientModule } from '@angular/common/http';
  +// Native Material modules only needed for demo shell
  import {
  MatButtonModule,
  MatIconModule,
  @@ -85,6 +86,7 @@ import { WindowServiceComponent } from './components/services/window-service.com
  FlexLayoutModule,
  HttpClientModule,
  + // Native Material modules only needed for demo shell
  MatButtonModule,
  MatIconModule,
  MatMenuModule,
  