Update navigation links for moved Git topics

What does this MR do and why?

As a companion to gitlab!163271 (merged), and to contribute to gitlab#468098 (closed), update global navigation for moved topics.

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Merge request acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this merge request.