Documentation - Branch to a new display location to allow restructure of the swarm docs

This is part of the user-story and the related epic to improve documentation.

[User-Story] Documentation - Dapp Developer "How to get started?" #29

Currently the swarm docs are at
https://swarm-guide.readthedocs.io/en/latest/

Can we branch out to e.g.
https://swarm-guide.readthedocs.io/en/future/

?