fix(docs): relative apply link (#1060)

Co-authored-by: Clément Vannicatte <20689156+shortcuts@users.noreply.github.com>

packages/website/docs/what-is-docsearch.md

@@ -26,7 +26,7 @@ You can now [apply to the program][3]
 
 [1]: https://opencollective.com/algolia
 [2]: /docs/who-can-apply
-[3]: apply
+[3]: /apply
 [4]: https://www.algolia.com/products/search-and-discovery/crawler/
 [5]: https://crawler.algolia.com/
 [6]: https://www.algolia.com/doc/ui-libraries/autocomplete/introduction/what-is-autocomplete/