Fix dev-build routes

`dev-build` is routing requests to `facia` that it cannot handle. e.g. `/books`.
On `PROD` and `CODE`, `Nginx` takes us to the correct place.

On dev-build we need to be explicit.

This means that `dev-build` only handles what is in the routes file, and `applications` handles everything else.

@kaelig @stephanfowler