documentation
Update the README file (that referred to inria gforge, ubuntu 8.10, etc.) and convert it to markdown
GitLab upgrade completed. Current version is 18.5.4
https://about.gitlab.com/releases/2025/09/18/gitlab-18-4-released/
https://about.gitlab.com/releases/2025/10/16/gitlab-18-5-released/
Update the README file (that referred to inria gforge, ubuntu 8.10, etc.) and convert it to markdown