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Summary:
- Add linear_fbank method
- Add LFCC in transforms

Porting Tacotron2 from https://github.com/NVIDIA/DeepLearningExamples/blob/master/PyTorch/SpeechSynthesis/Tacotron2/tacotron2/model.py

`torchaudio.compliance.kaldi.resample_waveform` has been replaced with `torchaudio.funcitonal.resample`.

* 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`

- TorchScript-able `Wav2Vec2Model` class
- Factory functions for three configurations presented in the paper 
  - `wav2vec2_base`
  - `wav2vec2_large`
  - `wav2vec2_large_lv60k`

Co-authored-by: Vincent Quenneville-Belair <vincentqb@gmail.com>

Replace the prototype RNNT implementation (using warp-transducer) with one without external library dependencies

This PR additionally adds batching to kaldi compliance resample interface.

* Add griffinlim and DB_to_amplitude
* Fix Dataset docstring
* Fix other formatting
Co-authored-by: krishnakalyan3 <skalyan@cloudera.com>

Refer to #903 for the overview of planned I/O changes.

* Change the default backend from `"sox"(deprecated)` to `"sox_io"`
* Change the default interface of `"soundfile"` backend to the one identical to `"sox_io"` backend.
* Deprecate torchaudio.USE_SOUNDFILE_LEGACY_INTERFACE
* Update documentations
    * Re-order backends (default first)
    * Update overhaul timeline (removed 0.7.0)
    * Simplify `"soundfile"` backend description

Adds introductory context and links to the PyTorch Libraries to audio docs.

* Tweak docstring, audio_ext, load method signature and constructor of VCTK_092

* Add test for VCTK_092 dataset.

* Added version 0.92 of VCTK dataset
Signed-off-by: Abhishek Dubey <abhi.dubey011999@gmail.com>

* `istft` has been migrated to `pytorch`, and `torchaudio.functional.istft` has been deprecated in 0.6.0 release. This PR removes it
Co-authored-by: Jeremy Chen <jeremyyy@fb.com>