In the short-term, we need feedback about the wiki. Most crucially, please look at Namespaces and decide whether you like that structural arrangement! You may also want to take a glance at Templates and edit the skeleton there if you have issues with it. Any general feedback should go in Issues. You can also make new pages in this namespace if needed.
In the long-term, we need a guide about how to use the wiki. Any volunteers to write it?