refactor: remove old unused variables

Author: Sam H

src/pages/app-detailed-service/app-detailed-service.tsx

@@ -14,9 +14,6 @@ export class AppDetailedService {
   @Prop() history: RouterHistory;
   @Prop({ context: 'isServer' })
   private isServer: boolean;
-  private devClassName = localStorage.getItem('allowWebp') === 'true' ? 'webp development' : 'hero development';
-  private designClassName = localStorage.getItem('allowWebp') === 'true' ? 'webp design' : 'hero design';
-  private consultingClassName = localStorage.getItem('allowWebp') === 'true' ? 'webp consulting' : 'hero consulting';
 
   @State()
   imgs = {