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* Update Quantization docs and minor doc fix.

* update readme with latest quants info

* Apply suggestions from code review
Co-authored-by: Pedro Cuenca <pedro@huggingface.co>

* up

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Co-authored-by: Pedro Cuenca <pedro@huggingface.co>

This PR prefers the `huggingface_hub` library, refactors the grammar
docs and adds the new image_url api to the vlm docs.

This PR start to add documentation for visual language models