Transfer dataset scripts to Hub

[albertvillanova]

Before merging:

• [GH->HF] Part 2: Remove all dataset scripts from github #4974

TODO:

• Create label: "dataset contribution"
• Create project: Datasets: Transfer datasets to Hub
• PRs:
  • Add dataset: we should recommend transfer all additions of datasets to the Hub, under the appropriate namespace; no more additions of datasets on GitHub
  • Update dataset: in general, we should merge bug fixes; enhancements should be considered on a case-by-case basis, depending on whether there is a more suitable namespace on the Hub
• Issues

Finally:

• [GH->HF] Part 2: Remove all dataset scripts from github #4974

Let me know what you think! 🤗

[lhoestq]

Sounds good ! Can I help with anything ?