Fix main branch CI failures after MkDocs migration.

[maryamtahhan]

• Remove stale mkdocs.yml nav entry for docs/blog/rhaiis-hello-world.md (file was deleted in prior commit; strict MkDocs build was aborting)
• Add .nojekyll to prevent GitHub's legacy Jekyll builder from running (Ansible YAML files were crashing Jekyll with Liquid syntax errors)
• Add explicit CodeQL workflow scanning Python and Actions only (default auto-scan was failing on Ruby after Gemfile removal)

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📥 Commits

Reviewing files that changed from the base of the PR and between 5495eff and e421128.

📒 Files selected for processing (7)

• .github/workflows/github-pages.yml
• .nojekyll
• documentation/index.md
• hack/README.md
• hack/preview-site.sh
• hooks/edit_url.py
• mkdocs.yml

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