You're right, the Wiki does need content update that isn't player-RP stories.
About the exploring you're doing; a lot of the content we put on the wiki is retrieved from outside of the game, from data-files and generators and what have you. If you can take photos (Hide your HUD and go into cockpit view) of systems, bases and other things that need photos, excellent. As for ship sale points, missing ships and other such stuff, don't worry just yet.
Once the final version of 4.86 is released, we'll be all over it like me on ice-cream.
You're welcome to learn how to use system templates and work on system pages, as those can't be generated yet. Just keep in mind you'll need to double check all of them and fix changes once final is out. So I'd again say, just stay patient for a bit.