Merge branch 'redirects-for-sphinx' into 'master'

Client-side redirects extension for Sphinx

See merge request gitlab-org/gitlab!41963

doc/user/project/pages/introduction.md

@@ -68,7 +68,8 @@ location, you can use the [HTTP meta refresh tag](https://en.wikipedia.org/wiki/
 
 Some static site generators provide plugins for that functionality so that you
 don't have to create and edit HTML files manually. For example, Jekyll has the
-[redirect-from plugin](https://github.com/jekyll/jekyll-redirect-from).
+[redirect-from plugin](https://github.com/jekyll/jekyll-redirect-from), Sphinx
+has the [sphinx-reredirects](https://gitlab.com/documatt/sphinx-reredirects) extension.
 
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