Completely integrate wepack in django

* Migrate alpine
* Migrate jquery and jquery-ui
* Migrate shorten
* Add babel for javascript
* Introduce staticfiles django app
* Only bundle -index.js files in static/webpack
* Unify scss and webpack generated files
* Convert scss calls to static
* Add --clear-generated option to collectstatic
* Fix docs warnings

docs/reference/staticfiles/apps.md

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+::: staticfiles.apps.StaticFilesConfig

docs/reference/staticfiles/finders.md

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+::: staticfiles.finders

docs/reference/staticfiles/processors.md

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+::: staticfiles.processors

docs/reference/staticfiles/storage.md

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+::: staticfiles.storage