- Add scripts/mkdocs_hooks.py: on_page_markdown hook that prepends
`# {hostname}` + a Specs table built from the YAML frontmatter.
Reuses fmt_cpu/fmt_ram/fmt_storage/fmt_nic from gen_overview.py so
the host page and the index table stay in sync.
- Wire the hook into mkdocs.yml.
- Demote `# Notes` / `# ToDo` to `##` in the five host source files so
each rendered page has a single H1.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
