docs: remove not accepting contributions notice (#1647)

Remove the "not accepting contributions" notice from the root readme

Raising this PR cuz i don't see another PR being raised by the team
<img width="684" alt="Screenshot 2023-06-24 at 13 40 46"
src="https://github.com/tldraw/tldraw/assets/5616556/9684456f-9f6a-489b-b380-41484cd4fe18">

### Change Type

- [ ] `patch` — Bug fix
- [ ] `minor` — New feature
- [ ] `major` — Breaking change
- [ ] `dependencies` — Changes to package dependencies[^1]
- [x] `documentation` — Changes to the documentation only[^2]
- [ ] `tests` — Changes to any test code only[^2]
- [ ] `internal` — Any other changes that don't affect the published
package[^2]
- [ ] I don't know

[^1]: publishes a `patch` release, for devDependencies use `internal`
[^2]: will not publish a new version

### Test Plan

1. Add a step-by-step description of how to test your PR here.
2.

- [ ] Unit Tests
- [ ] End to end tests

### Release Notes

- Remove not accepting contributions notice from README

README.md

@@ -105,8 +105,6 @@ The source code for various apps and packages in this repository (as well as our
 
 Please see our [contributing guide](https://github.com/tldraw/tldraw/blob/main/CONTRIBUTING.md). Found a bug? Please [submit an issue](https://github.com/tldraw/tldraw/issues/new).
 
-Note: we are currently unable to accept contributions on the `@tldraw/tldraw` or `@tldraw/editor` packages while we work out our final licensing.
-
 ## Contact
 
 Find us on Twitter at [@tldraw](https://twitter.com/tldraw) or email [hello@tldraw.com](mailto://hello@tldraw.com). You can also [join our discord](https://discord.gg/rhsyWMUJxd) for quick help and support.