[docs] Adapters

[stevhliu]

Refactors the adapter docs.

[HuggingFaceDocBuilderDev]

The docs for this PR live here. All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update.

[sayakpaul]

Looking quite good. Wondering if merging of info from the different pages in the single page is okay for our users?

[stevhliu]

Thanks Sayak! I think merging into a single page would make it easier for users to find everything they need instead of having users skip around several different docs to find it.

[sayakpaul]

Significant work! I have left another round of comments. LMK if they make sense.