docs: update sidebar

[colinaaa]

Summary

• Remove BuildCache: this is duplicated with performance.buildCache
• Set collapsed: true: the same as lynx-website

This would make it easier to update the docs to lynx-website.

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

[changeset-bot]

⚠️ No Changeset found

Latest commit: 0c22d45

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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[codspeed-hq]

CodSpeed Performance Report

Merging #805 will not alter performance

_{Comparing colinaaa:colin/0514/docs (0c22d45) with main (d94f058)}

Summary

✅ 6 untouched benchmarks