New design
I think wiki does look kinda clunky at the moment, it could use some theming love, or at least changes to colours (dark mode, I beg!). I'm aware that making it look better would also make it work slower, but that could perhaps be solved with a "basic" and "eye-candy" mode. I'm not sure whether mediawiki is even capable of something like that, though I would like to see what others think about that.
This might seem stupid, yet I visit the wiki quite often actually, and also I think a more modern design could attract some people from outside the tech world who are used to gigaoctets of javascript eyecandy madness (yes, yes, I know, the project is for devs atm, but still..).