Add accelerators to quick start table

[aradys]

1. Create accelerators dropdown with following options and add it to quick start table:

• Huawei Ascend
• Intel Extension for PyTorch
• Intel Gaudi

2. Add commands to previous versions section

RFC: pytorch/rfcs#63

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[jgong5]

@soumith The draft is ready for review. The preview page is available here: https://deploy-preview-1596--pytorch-dot-org-preview.netlify.app/

[jgong5]

hi @soumith - does the proposed web site look good to you? https://deploy-preview-1596--pytorch-dot-org-preview.netlify.app/
In brief, we added a new drop-down menu "Accelerators" on the "Compute Platform" tab and the menu contains the newer platforms: "Intel Gaudi", "Intel Extension for PyTorch" and "Huawei Ascend", with instructions how to install them on Linux.

[johnnynunez]

also do the same with version of rocm6.1 and cuda 12.4 in nightly builds?
https://download.pytorch.org/whl/nightly/cu124
https://download.pytorch.org/whl/nightly/rocm6.1

and for jetson agx?
http://jetson.webredirect.org/jp6/cu122
http://jetson.webredirect.org/jp6/cu124

[albanD]

As mentioned in the RFC, this looks quite good but we do want to properly define backends expectations before updating the website.

The request change here is just to make sure we don't mistakenly merge this while the discussion is happening in the rfc.