Ah, I see, sorry misunderstood your question!
Indeed, the in-game wiki had been disabled.
The reason is that there has been so much change since I first made it and that I never been very satisfied in the way it was working so I decided to get rid of it.
I plan to create a new one from scratch, but I think it will only be available for the vanilla release with up-to-date details and may be in a different format.
In the meantime, I tried to provide guidance in the form of tooltips for the newer features.
Creating any form tutorial for 4x is difficult but I will do my best :P
But do not hesitate to ask: https://itch.io/t/969950/comments