feat: notebook replay comments can just be comments

[pauldambra]

we currently have 3 ways to comment on a recording

1. remove the ability to add notebook specific comments ✅
2. migrate the existing comments from notebook content to actual comments (we may do this lazily)
3. remove the special notebook comment display

[github-actions]

Size Change: 0 B

Total Size: 3.06 MB

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Filename	Size
frontend/dist/toolbar.js	3.06 MB

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[greptile-apps]

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