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Summary:
Add badges of supported properties and devices to functionals and transforms.

This commit adds `.. devices::` and `.. properties::` directives to sphinx.

APIs with these directives will have badges (based off of shields.io) which link to the
page with description of these features.

Continuation of https://github.com/pytorch/audio/issues/2316
Excluded dtypes for further improvement, and actually added badges to most of functional/transforms.

Pull Request resolved: https://github.com/pytorch/audio/pull/2321

Reviewed By: hwangjeff

Differential Revision: D35489063

Pulled By: mthrok

fbshipit-source-id: f68a70ebb22df29d5e9bd171273bd19007a81762

Summary:
* Before

https://pytorch.org/audio/main/models.html

<img width="852" alt="Screen Shot 2022-01-04 at 11 00 12 AM" src="https://user-images.githubusercontent.com/855818/148087255-3b94e63b-9870-4c7e-95c6-17acc1e65fef.png">

*After

https://503135-90321822-gh.circle-artifacts.com/0/docs/models.html

<img width="842" alt="Screen Shot 2022-01-04 at 10 59 40 AM" src="https://user-images.githubusercontent.com/855818/148087148-b951c7b0-d9cf-4014-8a50-b88c749f12ba.png">

Pull Request resolved: https://github.com/pytorch/audio/pull/2123

Reviewed By: carolineechen

Differential Revision: D33409661

Pulled By: mthrok

fbshipit-source-id: bb2dffea25ccc4356d257b2ab4a6e88f7f4e2bb3

* Use `bibtex` for paper citations.
  * add `override.css` for fixing back reference.
  * wav2vec2
  * wav2letter
  * convtasnet
  * deepspeech
  * rnnt-loss
  * griffinlim
* Fix broken references in `filtering`.
* Fix note in soundfile backends.
* Tweak wav2vec2 example.
* Removes unused `pytorch_theme.css`