Rebuild frontend

[maxime-rainville]

All the JS dependencies on this module are way out of date. The UI in this module has no link to the rest of the CMS and simply adds a bit of integration around graphiql. There's no point using our @silverstripe/webpack-config because there's no interaction with the CMS.

We should just scrap the existing JS logic and rebuild everything from scratch with the latest version of all the dependencies and a boiler plate webpack config.

@unclecheese suggests using graphql-playground instead of graphiql.