Publish the community docs on the site #133

CONTRIBUTING.md, SUPPORT.md, AI_POLICY.md, ROADMAP.md and CHANGELOG.md live at the repo root and are not published on the docs site. Someone who lands on https://unplugai.github.io/Unplug/ sees the SDK guides and has no route to contributing, getting help, or the roadmap.

Those five files have to stay at the repo root. GitHub reads them for the community-standards checklist, the security tab, and the sidebar links, and they stop working if you move them. So this is a build-time copy, not a move.

What to do:

1. In .github/workflows/docs.yml, add a step before mkdocs build that copies the five files into docs/ (a project/ subdirectory keeps them separate from the SDK guides).
2. Add a Project section to the nav in mkdocs.yml pointing at the copied paths.
3. Make sure the copy target is gitignored so a local mkdocs serve does not leave untracked files behind.

Acceptance:

• All five pages render on the site and appear in the nav.
• mkdocs build --strict still passes, which means every link inside those files has to resolve from the new location. Several use relative paths that will need adjusting.
• git status is clean after a local build.

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