Integrate with atomic-data-browser

[joepio]

Turning Atomic Data into HTML is something that is currently done in two ways: with Tera templates in this repo, and with React / Typescript with atomic-data-browser. The second approach results in a far better and more flexible product, although it does not support server side rendering at the moment.

I think using atomic-data-browser as a default makes sense, as it is a more impressive demo and an all-round more feature-rich environment. But in order to replace the Tera templates, some issues need to be tackled:

• only send HTML requests to the JS front-end. I gues I'll need a guard-header for that?
• front-end should be able to resolve urls with a new route that catches all
• don't use the hashrouter anymore