Remove metrics dashboard-related api docs from nav
What does this MR do and why?
The Dashboard annotations API & User-starred metrics dashboards API have been long deleted, but the docs haven't been cleaned up yet. We should remove them from the nav.
Related doc changes:
- Remove references to Metrics Starred Dashboards... (gitlab!162921 - merged)
- Remove references to Metrics Dashboard Annotati... (gitlab!162922 - merged)
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