hugo template housekeeping

[dvdksn]

• site: add mainEntityOfPage, inLanguage schema.org metadata
• site: simplify guides/series layouts
• site: simplify base templates
• site: simplify security-announcements rss page
• site: use content adapters for cli reference
• chore: move cli data files to data subdir
• fix: unhide desktop/offload plugin root commands
• chore: delete scout docker-cli-plugin-hooks datafile

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[docker-agent]

Review Summary

This PR successfully refactors the CLI reference documentation infrastructure to use Hugo content adapters instead of static markdown files. The changes are systematic, well-coordinated, and include proper redirects.

What was checked

✅ No vendored content modified - Only documentation and template files changed
✅ Redirects in place - All ~500 deleted CLI reference pages have redirects in data/redirects.yml
✅ Link updates correct - Systematic removal of .md extensions and path updates (e.g., /engine/reference/commandline/* → /reference/cli/docker/*)
✅ Front matter consistent - skill → proficiencyLevel, prereq → prerequisites applied consistently
✅ Documentation updated - COMPONENTS.md accurately documents the new series layout parameters
✅ No style violations - No AI-isms, hedge words, or style guide violations introduced
✅ No markdown issues - All formatting changes are correct

Infrastructure improvements

• CLI reference pages now generated dynamically from YAML data files in data/cli/
• Cleaner link structure (trailing slashes, no .md extensions)
• Better documentation of series layout parameters for guide authors
• Simplified Hugo templates and layouts

No issues found. Excellent work on this infrastructure upgrade! 🚀