Add navigation item for repository archive rate limits documentation

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Summary

Add a new navigation item to the navigation.yml file for the repository archive rate limits documentation page.

Details

The documentation page doc/administration/settings/repository_archive_rate_limits.md was added in GitLab 18.9 but needs to be included in the navigation structure.

Tasks

• Add navigation entry in the navigation.yml file
• Place under the appropriate section (likely under Administration > Settings > Network or similar)
• Verify the navigation link works correctly on docs site

Documentation

• Documentation page: doc/administration/settings/repository_archive_rate_limits.md

Related

• https://gitlab.com/gitlab-org/security/gitlab/-/merge_requests/5620#note_3041526020