Prototype updated XNNPACK doc structure

[SS-JIA]

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• [ET-VK][docs] Update to the new template #14996
• Add op support table #14995
• -> Prototype updated XNNPACK doc structure #14994

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/14994

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❌ 2 New Failures, 1 Unrelated Failure

As of commit 0c47d79 with merge base 5dee222 ():

NEW FAILURES - The following jobs have failed:

• Lint / link-check / lint-xrefs / linux-job (gh)
  RuntimeError: Command docker exec -t ca4e6d0ce255f1af5b6a3af0d3da24670a25211299f103a6ba9dd1d8f4b98b40 /exec failed with exit code 1
• pull / test-samsung-models-linux / linux-job (gh)
  RuntimeError: Command docker exec -t db9903889236e92f2733098a6956a3c83410c4ab5f3faff626d237c40b2eff3e /exec failed with exit code 1

BROKEN TRUNK - The following job failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• pull / unittest-arm-backend-with-no-fvp (test_pytest_models) / linux-job (gh) (trunk failure)

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