Codeberg doesn't execute Forgejo Actions (no runners), so the docs.yml
workflow never ran. Replace it with scripts/publish-docs.sh: build the
mdBook and force-push docs/book/ to the `pages` branch that Codeberg
Pages serves. Installs mdbook on demand, derives the Pages URL from the
origin remote, and honors CODEBERG_TOKEN for non-interactive auth.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
