Docs: add link to the docs site from /help landing page
What does this MR do?
Ports https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/23434 to EE
Author's checklist
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Apply the correct labels and milestone -
Port the MR to EE (or backport from CE): https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/23434
Review checklist
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Merge the EE-MR first, CE-MR afterwards
Edited by Achilleas Pipinellis