[Glitch] Change how content warnings and filters are displayed in web UI

Partially apply 500f4925a5 to glitch-soc

Signed-off-by: Claire <claire.github-309c@sitedethib.com>

app/javascript/flavours/glitch/components/content_warning.tsx

@@ -0,0 +1,15 @@
+import { StatusBanner, BannerVariant } from './status_banner';
+
+export const ContentWarning: React.FC<{
+  text: string;
+  expanded?: boolean;
+  onClick?: () => void;
+}> = ({ text, expanded, onClick }) => (
+  <StatusBanner
+    expanded={expanded}
+    onClick={onClick}
+    variant={BannerVariant.Yellow}
+  >
+    <p dangerouslySetInnerHTML={{ __html: text }} />
+  </StatusBanner>
+);