Update global nav for combined managing monorepos documentation
What does this MR do and why?
With gitlab!124527 (merged), two pages have merged into one.
This MR removes a global nav item for a page that is redirected, and also renames and slightly moves the global nav item for the combined page.
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Configure a local GitLab Docs environment: https://gitlab.com/gitlab-org/gitlab-docs/-/blob/main/doc/setup.md.
Merge request acceptance checklist
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I have evaluated the MR acceptance checklist for this merge request.