remove unused css files and styleUrl properties from components (#48)

Reviewed-on: http://git.simonis.lol/angular/ems-frontend/pulls/48
Co-authored-by: Jan-Marlon Leibl <jleibl@proton.me>
Co-committed-by: Jan-Marlon Leibl <jleibl@proton.me>

src/app/employee/details/details.component.ts

@@ -14,7 +14,6 @@ import { DialogRef } from '@angular/cdk/dialog';
   imports: [MatDialogTitle, MatDialogContent, MatButton, MatDialogActions],
   templateUrl: './details.component.html',
   standalone: true,
-  styleUrl: './details.component.css',
 })
 export class DetailsComponent {
   employee: Employee = inject(MAT_DIALOG_DATA);