fix(docs): add docs/package.json so pnpm -C docs build resolves

[iamnewton]

The deploy workflow runs pnpm -C docs build which requires a package.json in docs/. Since astro.config.ts lives at the repo root, scripts pass --root .. so Astro finds it. No deps needed — all Astro packages are at the root.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

@@           Coverage Diff           @@
##             main     #229   +/-   ##
=======================================
  Coverage   95.40%   95.40%           
=======================================
  Files           6        6           
  Lines          87       87           
  Branches       11       11           
=======================================
  Hits           83       83           
  Misses          2        2           
  Partials        2        2           

🚀 New features to boost your workflow:

• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[iamnewton]

🎉 This PR is included in version 0.4.2 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot 📦🚀