Move Mattermost doc from Omnibus to main project
Move docs from Omnibus project to main project.
related MRs:
part of "Move all the Omnibus documentation to the gitlab-org/gitlab project" &5173
Related issues
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Link to the merge request of the new page:
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Give the MR a descriptive title. -
Link to the merge request that introduced the new page.
Edited by Amy Qualls