Get react-docgen to work with storybook

[chrisvanmook]

Make sure we can display a Props table like so:

import { Meta, Story, Preview, Props } from '@storybook/addon-docs/blocks'

import { Button } from '@datapunt/asc-ui'

<Meta title='Button' component={Button} />

## Props

<Props of={Button} />

After several attempts I cannot get this to work, even with customising the webpack config. This is probably because react-docgen-typescript doesn't read from d.ts files