Remove references to old settings location

What does this MR do?

Remove any refs to the old settings location under the wheel icon.

Does this MR meet the acceptance criteria?

• Documentation created/updated
• Conform by the merge request performance guides
• Conform by the style guides
• Branch has no merge conflicts with master (if it does - rebase it please)
• Squashed related commits together

What are the relevant issue numbers?

Part of https://gitlab.com/gitlab-org/gitlab-ce/issues/29384, resolves https://gitlab.com/gitlab-org/gitlab-ce/issues/33041