Un-eject create-react-app

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From talking with @gustavlrsn it sounded like most of the files in at least ui/config and ui/scripts were automatically generated when ejecting from create-react-app. They're pretty complex and they're not updated when we update react/webpack, so it feels like they'll break eventually.

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Erik said if we remove the webpack configs then then @ imports will stop working but we could use https://code.visualstudio.com/docs/languages/jsconfig instead to set the root import location

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https://create-react-app.dev/docs/importing-a-component/#absolute-imports

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The commit that ejected bf7c423

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Apparently we might need react-scripts@3 to be able to use the absolute imports https://medium.com/hackernoon/absolute-imports-with-create-react-app-4c6cfb66c35d