implement card reference widget, fix DeckIcon.vue

bring back eslint and stylelint on compilation, fix almost all warnings, ignore some

Signed-off-by: Julien Veyssier <eneiluj@posteo.net>

src/components/navigation/AppNavigationBoardCategory.vue

@@ -34,7 +34,7 @@
 </template>
 
 <script>
-import AppNavigationBoard from './AppNavigationBoard'
+import AppNavigationBoard from './AppNavigationBoard.vue'
 import { NcAppNavigationItem } from '@nextcloud/vue'
 
 export default {