Placemark: Collaborate on maps

## About

> Placemark is now open source. In short:
> - MIT license
> - TypeScript codebase
> - Contributions welcome

## References

- https://www.placemark.io/
- https://github.com/placemark/placemark
- https://invidious.fdn.fr/watch?v=DPieLqdgdL0 ff.
