Clean up spacing around header buttons

What does this MR do and why?

Fixes irregular spacing around menus in the header.

Before After
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How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

  1. Configure a local GitLab Docs environment.
  2. Check out this branch.
  3. Verify buttons in the header are equally spaced apart and do not cause layout shift on load.

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.

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