[docs] Autocomplete styling tweaks (#2732)

This PR tweaks the styling in the autocomplete. It removes icons and
matches styles to the sidebar. It improves the mobile design to hide the
search bar on mobile.

### Change Type

- [ ] `patch` — Bug fix
- [ ] `minor` — New feature
- [ ] `major` — Breaking change
- [ ] `dependencies` — Changes to package dependencies[^1]
- [x] `documentation` — Changes to the documentation only[^2]
- [ ] `tests` — Changes to any test code only[^2]
- [ ] `internal` — Any other changes that don't affect the published
package[^2]
- [ ] I don't know

apps/docs/components/Spinner.tsx

@@ -1,5 +1,5 @@
 // TODO(mime): copied from tldraw package, needs to be in another shared location.
-export default function Spinner(props: React.SVGProps<SVGSVGElement>) {
+export function Spinner(props: React.SVGProps<SVGSVGElement>) {
 	return (
 		<svg width={16} height={16} viewBox="0 0 16 16" {...props}>
 			<g strokeWidth={2} fill="none" fillRule="evenodd">