POC: move handbook off VitePress to a headless CMS with reader RBAC + Google Workspace auth

[github-actions]

1. Target

• Closes POC: move handbook off VitePress to a headless CMS with reader RBAC + Google Workspace auth #68

2. Specification / Test Plan

(Text here)

3. Additional Instructions / Notes for Shipping (optional)

N/A

4. Check before Review Request

• Self Review : I reviewed changes by myself and approved them.
  • Ensure there is no sensitive information, typos, unrelated changes, or debugging code.
• Evidence : I attached evidences to prove the changes.
  • Record and attach a demo video. For minor changes, attaching an image is also acceptable.
  • Evidences should be updated to the latest version when further changes are made.

5. Evidence

(Attach here before request review)

[VibratingKoala]

Superseded by #72 — the POC direction changed from a headless CMS + Google Workspace auth to a from-scratch git-backed app with GitHub auth. No work landed on this branch (empty diff). #72 closes #68.