Refactor + overview and use cases for Groups-related EE-only features
See the general Documentation guidelines http://docs.gitlab.com/ce/development/doc_styleguide.html
What does this MR do?
Move Groups doc from
/workflowto the correct location
- Add overview and use cases to groups
- Add overview and use cases to "Lock project membership to group"
- Replace/delete old screenshots
Moving docs to a new location?
- Make sure the old link is not removed and has its contents replaced with a link to the new location.
- Make sure internal links pointing to the document in question are not broken.
Search and replace any links referring to old docs in GitLab Rails app, specifically under the
- If working on CE, submit an MR to EE with the changes as well => https://gitlab.com/gitlab-org/gitlab-ce/issues/35068
For #2703 (closed)