Move documentation to Wiki

[eudyptula]

We should consider migrating all documentation (from https://github.com/arrowhead-f/core-java/tree/master/documentation) to the wiki pages...

[uzoltan]

There is certanly some merit to doing this, but I feel like what would be even better is to have the general SoSDD and SysDD documentations here on the wiki page, and the contents of the SD and IDD docs should be hosted on the core system webservers. There are some tools for this in Java that help facilitate this (Spring REST docs is 1 that comes to mind), and I guess there are similar tools in other languages as well.

[eudyptula]

Just realised that there were some inconsistencies between the documents I had inside the repository and then those on the wiki.

At least I think I manage to fix it (and delete those in the repo.), so hopefully I remember to update the wiki the next time instead...

Btw. realised that the wiki is just a repository in itself (https://github.com/arrowhead-f/core-java.wiki.git).