docs: fix package folder image link

[WuMingDao]

🎯 Changes

✅ Checklist

• I have followed the steps in the Contributing guide.
• I have tested this code locally with pnpm run test:pr.

🚀 Release Impact

• This change affects published code, and I have generated a changeset.
• This change is docs/CI/dev-only (no release).

[KevinVandy]

we copy over any changes made to the readmes in the packages from the root, so we'd need to have a script do the replacement. Although, I'm not too worried about this issue in the first place to put forth effort to do that.