Add reference to product map.
What does this MR do?
Mention the product map in the UI Guide and remove a line that says that the GitLab logo and user picture and in the sidebar.
What are the relevant issue numbers?
19350
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CHANGELOG entry added -
Documentation created/updated -
API support added - Tests
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Added for this feature/bug -
All builds are passing
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Conform by the style guides -
Branch has no merge conflicts with master
(if you do - rebase it please) -
Squashed related commits together Closes #19350 (closed)