[codex] add Docusaurus to project suggestions

[Sean-Kenneth-Doherty]

Summary

• adds Docusaurus to the project suggestions list
• enables beginner-friendly issue previews for the Docusaurus card

Addresses #1.

Validation

• verified facebook/docusaurus is public and not archived
• verified current open beginner-friendly issue #5691 has good first issue and status: accepting pr labels
• verified the Docusaurus avatar URL returns 200 image/png
• git diff --check
• GITHUB_TOKEN=$(gh auth token) pnpm build
• inspected dist/index.html: Docusaurus card renders, 153 project cards total, and Docusaurus issue #5691 renders

[Sean-Kenneth-Doherty]

Fresh validation against the current PR head (32bf372):

• facebook/docusaurus is public, unarchived, and currently uses main as its default branch
• the configured Docusaurus avatar URL returns 200 image/png
• GITHUB_TOKEN=$(gh auth token) pnpm build -> Astro build succeeded, 2 pages
• imported projectList and confirmed the Docusaurus card uses https://github.com/facebook/docusaurus with loadIssues: true
• confirmed generated dist/index.html contains the Docusaurus card and Docusaurus issue preview links
• git diff --check origin/main...HEAD -> clean

Generated .astro/dist output was restored after validation.

[Sean-Kenneth-Doherty]

Closing this to reduce maintainer review noise from my project-suggestion-only PR batch. I am pruning these so the queue can focus on concrete bug, security, accessibility, and performance fixes.