Complete doc migration
The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/datasets/pr_5248). All of your documentation changes will be reflected on that endpoint. Thanks for the fix @mishig25.

I guess this is the reason why the docs are not generated for the latest release version 2.7.0? https://huggingface.co/docs/datasets/index 
Reverts huggingface/datasets#5214

Everything is handled on the doc-builder side now 😊