Replace mkdocs-awesome-pages-plugin with mkdocs-awesome-nav

[aburdenthehand]

The awesome-pages plugin has been superseded by awesome-nav. This change:

• Renames .pages files to .nav.yml (file format is identical)
• Updates mkdocs.yml to use awesome-nav plugin
• Updates Makefile and netlify.toml dependencies
• Updates documentation references

What this PR does / why we need it:
The mkdocs-awesome-pages-plugin has been outdated for a while. This updates it and all relevant files to use the updated plugin. There should not be any change in functionality.

Special notes for your reviewer:

Merge needs to be coordinated with the associated Dockerfile update in the project-infra repo: kubevirt/project-infra#5069

Checklist

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Approvers are expected to review this list.

• Design: A design document was considered and is present (link) or not required
• PR: The PR description is expressive enough and will help future contributors
• Code: Write code that humans can understand and Keep it simple
• Refactor: You have left the code cleaner than you found it (Boy Scout Rule)
• Upgrade: Impact of this change on upgrade flows was considered and addressed if required
• Testing: New code requires new unit tests. New features and bug fixes require at least on e2e test
• Documentation: A user-guide update was considered and is present (link) or not required. You want a user-guide update if it's a user facing feature / API change.
• Community: Announcement to kubevirt-dev was considered

Release note:

NONE

[kubevirt-bot]

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