feat: přidání K-ON! theme

client/src/App.tsx

@@ -13,6 +13,7 @@ import './App.scss';
 import './themes/umamusume.scss';
 import './themes/mlp.scss';
 import './themes/hellgirl.scss';
+import './themes/kon.scss';
 import { faCircleCheck, faNoteSticky, faTrashCan, faComment } from '@fortawesome/free-regular-svg-icons';
 import { useSettings } from './context/settings';
 import Footer from './components/Footer';