Merge branch 'eread/split-vale-rules' into 'master'

Split Vale rules into gitlab-base and gitlab-docs

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/161127



Merged-by: Kati Paizee <kpaizee@gitlab.com>
Approved-by: Kati Paizee <kpaizee@gitlab.com>
Approved-by: Diana Logan <dlogan@gitlab.com>
Co-authored-by: Evan Read <eread@gitlab.com>