Merge branch 'docs-maintenance-may24-startremove' into 'master'

Remove outdated docs content

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/154008



Merged-by: Phillip Wells <pwells@gitlab.com>
Reviewed-by: Lorena Ciutacu <lciutacu@gitlab.com>
Co-authored-by: Lorena Ciutacu <lciutacu@gitlab.com>