[Accessibility Docs] Search and filter

Using [this template](https://docs.google.com/document/d/1IwFMfJrTfJPXDcVJfLWXYkw-pjgWhBWo4GX8X098Q64/edit#), create accessibility docs for [Search and filter](https://vanillframework.io/docs/patterns/search-and-filter)

Start with the linked accessibility documentation template and the Search and filter pattern page. Create the accessibility docs for that pattern using the template; done means the requested documentation is complete and follows the template.

Written by the indexing model from the issue text.