Docs 404 page not working

[jseldess]

When you call up a non-existing page for which we don't have a redirect in place, we no longer show our custom 404 page, e.g., this file for 19.1 docs: https://github.com/cockroachdb/docs/blob/master/v19.1/404.md.

Example of when you should get that 404 page (client-driver.html instead of the correct client-drivers-html): https://www.cockroachlabs.com/docs/stable/install-client-driver.html.

[jseldess]

Solution: https://www.netlify.com/docs/redirects/#custom-404