Eject project and customize webpack, babelrc, and eslint if necessary

[alexdlaird]

The solution here (though we may not ever need to do it) is to first "eject" from using react-scripts: https://github.com/facebook/create-react-app/blob/master/packages/react-scripts/template/README.md#npm-run-eject

Once this is done, we'll want to cleanup what we have and possibly merge it with these other Babel and eslint configs:

{
  "presets": [
    "env",
    "react",
    "stage-3",
  ]
}

^ .babelrc

https://github.com/joshuaslate/mkrn-starter/blob/master/app/.eslintrc

[alexdlaird]

Closing, as the Helium project is not currently active.