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[WIP] Get started docs

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# What does this PR do?

This PR contains the first draft of the Get Started docs as discussed for the new Transformers IA. Some additional thoughts:

- I think adding better signposts on the landing page will help users quickly get to the content they are looking for. For inspiration, maybe we can have cards like [these](https://stripe.com/docs/payments?payments=popular) with links to the pages (cc @mishig25). From the analytics, it looks like people view fine-tuning a pretrained model, fine-tuning for common downstream tasks, installation, and the BERT docs a lot. The first two pages definitely look valuable for getting users up and running with their tasks, but I would love to hear what other pages you think we can add to help guide users down the right path.

- On the Quick tour page, it'd be neat if we can embed a widget there (cc @mishig25) for sentiment analysis so users can play with it directly.