docs(popover-examples): import styles in mdx file

Author: maiieul

apps/website/src/routes/docs/headless/popover/index.mdx

@@ -3,9 +3,7 @@ title: Qwik UI | Popover
 ---
 
 import { statusByComponent } from '~/_state/component-statuses';
-import { Note } from '~/components/note/note';
-import { FeatureList } from '~/components/feature-list/feature-list';
-import { APITable } from '~/components/api-table/api-table';
+import styles from './snippets/popover.css';
 
 <StatusBanner status={statusByComponent.headless.Popover} />