Before the new release i strongly urge to remove [1] along with the primer and examples.
Also the removal of wiki, Example and primers from [2] is expected as well.
The reason is the same information is being duplicated and not being updated. Today i nearly lost 4 hours trying to simulate primer given on github. :-(

i suggest to maintain [3] as the core+fixed documentation source which will be updated with each major release and to use [4] as the temporary documentation place which can be updated later.
however, Importance of  [5] is astronomical. any resolved issue can be directly implemented in [4].