I think it might be beneficial to clearly structure the different ways O7s can be viewed AND link directly to relevant documentation. Maybe also clearly structuring the sidebar might help, because in my opinion it is a bit chaos right now. I subdived this myself, I'm convinced category 2,3 & 4 need to be clearly distinguished. I think category 1 is then the overarching story, with 5 also being important to view separately. Also would be beneficial to split off links like 'Recent changes' and 'Random page' in the sidebar.
1. The overall architecture? Architectural documents?
'The story', I'd say. Maybe also Getting Started aka installation of the O7s prototype fits here? It is needed for 2,3 and 4 at least... Network Model, Core Protocols, Glossary and FAQ fit also in this category.
5. Community :)
Includes contact page