This PR fixes a check on whether the dot com multiplayer editor has been
loaded in an iframe.
It tries to keep it working on tldraw.com itself.
### Change Type
- [x] `patch` — Bug fix
### Test Plan
1. Load me in an iframe
This PR moves the tldraw.com app into the public repo.
### Change Type
- [x] `internal` — Any other changes that don't affect the published
package[^2]
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Co-authored-by: Dan Groshev <git@dgroshev.com>
Co-authored-by: alex <alex@dytry.ch>