[Inference] Mention local endpoints inference + remove separate HF Inference API mentions (#3085)
* revamp doc
* nit
* tip
* nit
* review suggestions
Co-authored-by: Lucain <lucain@huggingface.co>
* review suggestions
Co-authored-by: Lucain <lucain@huggingface.co>
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Co-authored-by: Lucain <lucain@huggingface.co>