Currently we only have a list as a start page to the wikis, where all pages are listed that are in the current wiki.
For people new to the project a general guide where to find which kind of information (in all wikis) can be found. More important information should be highlighted there.
The page should be used in general in all wikis (Releases, Developers, Adopters) but may highlight features from the currently selected wiki.
Added some information regarding the different wikis to all start pages.