[docs] Docs for writing ATen IR passes + FX Pattern matching

[angelayi]

I'm not really sure where to put this...maybe just link it somewhere in torch.compile docs?

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[msaroufim]

Yup this is a perfectly fine place just make sure to also link to it here https://github.com/pytorch/pytorch/blob/main/docs/source/index.rst

[msaroufim]

This was reaally timely and thank you was super clear to read

Just a minor nit on the index to make it render on the homepage as well

[angelayi]

@pytorchbot merge

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[angelayi]

@pytorchbot merge -f "ily cat 🥺"

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