New playground

[arnaudmiribel]

Changes

Preview gallery • Preview docs

• Gallery app now features a Playground section where folks can choose an extra and play with it using the awesome stlite and stlite-dynamic-sandbox components.
• Gallery app also went through a re-design. And requires streamlit-pills.
• Refactored extras metadata to merge __playground__ (deprecated) and __stlite__. Merged into __playground__
• Docs now use __playground__ and also redirect folks to the playground if they want to edit the embedded stlite
• Edited one or two extras to unlock their playgrounds, hopefully - it's hard to test since stlite can't use packages from source, I basically need a version upgrade to test this out eheh
• Upgrade stlite version in the docs and in the extra

Some screenshots:

New Gallery	New Docs

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