Publicly hosted documentation

[smartsammler]

Are you interested in having a publicly accessible version of the documentation (via read the docs)?

As already mentioned in the issue #80
I would like to know if you are willing and being interested in hosting the documentation publicly at readthedocs.
This implies some modifications, but might be nice to have, especially because one can integrate it with Github to automatically build the documentation.
For now I created an example at https://ocelot-collab-docu.readthedocs.io/en/latest/, but I think that at least one core developer should be the administrator, too, if you do not want to set it up on your own.
For the changes to get this running I can create a PR for sure, but it also involves some configuration steps at readthedocs.io itself.

I think it's a bit more accessible and might result in more consistent and improved documentation.
Of cause I can fully understand if you do not want to have this as it also means one more thing to take care of or "un-provision" in case things break.