Reorganize contributors pipeline and improve page

- Move scripts to utils/contributors/src/ and data to utils/contributors/data/
- Remove redundant public/harbor_contribution.json copy
- Add ctbcli with refresh, refresh-prdata, refresh-userdata, generate commands
- Add verified_github_users_data.json as source of truth for curated info
- Rank Harbor Contributors by rank then non-adapter PR count
- Rank Adapter Contributors by adapter_rank then adapter PR count
- Show name, GitHub handle, and role on contributor cards
- Include verified users with no PRs (e.g. advisors) in output
- Refresh data: 332 merged PRs, 126 contributors
- Add README documenting the pipeline

Author: Hangzhi