Migrate frontend prefix to -pngx

src-ui/src/app/components/common/page-header/page-header.component.ts

@@ -3,7 +3,7 @@ import { Title } from '@angular/platform-browser'
 import { environment } from 'src/environments/environment'
 
 @Component({
-  selector: 'app-page-header',
+  selector: 'pngx-page-header',
   templateUrl: './page-header.component.html',
   styleUrls: ['./page-header.component.scss'],
 })