Redoc: The docs would be better readable if not expanded by default

[karussell]

As I learned today about your docs, this is our automatically generated docs and looks useful. But as a developer I'm overloaded with attributes. Instead I would like to see root entries at the start only (for our API and the "vrp" endpoint this would be just algorithm, relations, services, ...) and then expand just one entry like services to see address, allowed_vehicles, etc

[RomanHotsiy]

@karussell great idea! Thanks.
I will definitely implement this for the first public release.

[RomanHotsiy]

@karussell I've implemented the feature.
You can check your spec look now!

[karussell]

Cool, looks good!

Will include this then in our docs -> https://github.com/graphhopper/directions-api/issues/32