Refactor + overview and use cases for Groups-related EE-only features

username-removed-236961 requested to merge docs/add-features-groups into master

See the general Documentation guidelines

What does this MR do?

  • Move Groups doc from /workflow to the correct location user/groups
  • 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?

See the guidelines:

  • 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 app/views/ directory.
  • If working on CE, submit an MR to EE with the changes as well =>

For #2703 (closed)

Edited by username-removed-236961

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