move the docs page
This change should move https://huggingface.co/docs/datasets-server to https://huggingface.co/docs/dataset-viewer.

cc @mishig25: we also need to redirect https://huggingface.co/docs/datasets-server to https://huggingface.co/docs/dataset-viewer. Where do we do it?
move the docs page: This change should move https://huggingface.co/docs/datasets-server to https://huggingface.co/docs/dataset-viewer.

cc @mishig25: we also need to redirect https://huggingface.co/docs/datasets-server to https://huggingface.co/docs/dataset-viewer. Where do we do it?