Convert the documentation to gitlab markdown format
Each project has a Wiki page that could hold the documentation.
There are some tools to convert all html files to markdown files (pandoc is an example)
The 17.0 major release is coming on May 16, 2024! This version brings many exciting improvements to GitLab, but also removes some deprecated features. We are introducing three breaking change windows during which we expect breaking changes to be deployed to GitLab.com. You can read more about it on our blogpost. The first breaking change window begins 2024-04-22 09:00UTC and ends 2024-04-24 22:00UTC.
Each project has a Wiki page that could hold the documentation.
There are some tools to convert all html files to markdown files (pandoc is an example)