NXP backend: Fix missing NXP backend documentation page in release 1.0 documentation

[StrycekSimon]

Summary

• Fixes invalid link to NXP backend documentation page.
• Adds proper documentation page for NXP backend.

Test plan

Documentation built locally using Makefile without any problems.

cc @robert-kalmar @JakeStevens @digantdesai

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/14851

• 📄 Preview Python docs built from this PR

Note: Links to docs will display an error until the docs builds have been completed.

❌ 2 Cancelled Jobs, 1 Unrelated Failure

As of commit 5eba1de with merge base e0dda90 ():

CANCELLED JOBS - The following jobs were cancelled. Please retry:

• pull / unittest / macos / macos-job (gh)
  ##[error]The operation was canceled.
• pull / unittest-editable / macos / macos-job (gh)
  ##[error]The operation was canceled.

FLAKY - The following job failed but was likely due to flakiness present on trunk:

• pull / unittest-arm-backend-with-no-fvp (test_pytest_models) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)

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[StrycekSimon]

This can be considered a bugfix PR since NXP backend link was incorrect.

[StrycekSimon]

@pytorchbot label "module: nxp"

[mergennachin]

We just did a big refactoring (and will cherry-pick onto release/1.0 branch soon)

#14720

here's the preview:
https://docs.pytorch.org/executorch/main/

Please rebase to latest main and change appropriately.

[StrycekSimon]

I was not sure if the new look of documentation is supposed to be a part of the release so I raised PRs to both main and release/1.0. I am closing this one since the PR to main was merged already.