Finish Documentation

[PRijnbeek]

Would it be possible to finish the documentation:

ARACHNE DataNode authentication methods configuration
ARACHNE DataNode datasource configuration
Analysis preparation and configuration
Analysis execution and results

We like to start testing and rolling out Arachne.

[PRijnbeek]

@konstjar this is still open can it be picked up we need to improve the documentation. It is very hard for databases to install Arachne.

Please make sure that the readme has a link to the wiki.