chore: remove CSS source

[francoischalifour]

We don't use the CSS source of this project anymore but rely on InstantSearch.css.

[algobot]

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[Haroenv]

docgen & dev novel should now use InstantSearch.css

[francoischalifour]

@Haroenv Dev novel already uses InstantSearch.css: https://github.com/algolia/instantsearch.js/blob/chore/remove-css-source/dev/template.html#L16

Docgen needs InstantSearch styles only for the widget showcase, which relies on InstantSearch 2 for now. We need to publish InstantSearch 3 beta and add the styles there afterwards: https://github.com/algolia/instantsearch.js/blob/chore/remove-css-source/docgen/layouts/widget-showcase.pug#L6

[Haroenv]

hmm, indeed for a separate PR, but would be nice if it could come from source instead (although it barely matters since this docs site won't live for very long anymore)

[francoischalifour]

I'm not sure it's worth the trouble to be honest.

[samouss]

Once we drop the doc from this repo we have to clean the package.json. There is some deps that are only use for docgen on the top level package. Don't think it worth the effort since we'll drop most of them with the doc move.

[francoischalifour]

@samouss I tried removing as many top-level dependencies as possible but we actually use them for the dev/ folder and our stories.

We can still do another pass later.