Added links to hardening documentation
What does this MR do and why?
This MR adds navigation links to the recently added Hardening documentation. It includes the main document and the 5 additional sub-documents.
Screenshots, screen recordings, or links to review app
These are strongly recommended to assist reviewers and reduce the time to merge your change.
How to set up and validate locally
Numbered steps to set up and validate the change are strongly suggested.
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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
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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I have evaluated the MR acceptance checklist for this merge request.