

TITLE
Audio/vision task guides

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This PR adds fine-tuning guides for image classification, audio classification, and ASR since the APIs for these tasks are stable. Some general notes:

- The audio guides don't have TensorFlow sections yet.
- For image classification, there is a difference between the PyTorch and TensorFlow preprocessing methods. The TensorFlow example doesn't really add any transforms because I couldn't figure out how to integrate the Keras preprocessing/augmentation layers. ☹️ If we want to show some more substantial transforms, let me know and I can share my notebook or create an issue.
- Would be cool to add a widget to each guide so users can see the end result and what they can create!