Move KB0005481
Move https://cern.service-now.com/service-portal?id=kb_article&n=KB0005481 to:
https://gitlab.docs.cern.ch/docs/Organize%20work%20with%20projects/ (i.e., under https://gitlab.cern.ch/vcs/gitlab-user-documentation/-/tree/master/docs/docs/3-Organize%20work%20with%20projects) > file named git-repo-exceeds-limits.md