Update doc/user/project/pages/redirects.md with

What does this MR do and why?

The Let's encrypt automatic integration for gitlab pages is not working when using wildcard redirects.

I.e. /* /index.html 200 in _redirects file for pages.

This commit mentions a workaround in the docs.

How to set up and validate locally

For the bug see: #342781 (closed)

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.