create guid_owncloud_infinite_scale.rst

[pbielefeldt]

basically taken from https://owncloud.com/news/hosting-infinite-scale-uberspace-ubernauten/

see #929

[noave]

@pbielefeldt thanks for starting the guide, do you want to take for those changes or should we take over here?

[pbielefeldt]

@pbielefeldt thanks for starting the guide, do you want to take for those changes or should we take over here?

@noave Thanks for asking. Currently, I don't have the capacity myself to push this forward. I also noticed that with this guide, the installation will be pretty unstable; this might need more investigation anyway (and more knowledge about ownCloud InfintScale than I currently have).

Hence, if there's someone who wants to and can continue on working on this guide, that would be great!

(Also: I can't compile the repo and I have no knowledge about the markup language used here, so that's an additional issue :-) ...)