Improve and update the official documentation
this is the one we reference to
Use the repro documentation to add internal stuff or things which go too deep to be used in the official docs. Link the official doc into the local doc
Benefit:
One place to maintain for each part, clear structure and responsibilities
New updated docs should be ready when we reach Milestone https://github.com/owncloud/data_exporter/milestone/6
@IljaN and me will provide all the information.