MediaWiki. Is there something wrong with the solution powering Wikipedia? It’s very simple to set up, and you can one-click deploy it on DigitalOcean for $10/month.
I gave MediaWiki a shot just now but it's seriously lacking Markdown support. Seems that there's a plugin for it but that's a no-go in the docker setup, would need to make my own container because it depends on some php package that doesn't come in the default image. Really a shame the docker setup isn't made to be extensions friendly.
You're right. I was going to tell you about what a nightmare infoboxes are, but my experience is clearly out of date. I guess I'm used to a large public failure killing a project. I'm extremely impressed by the experience now and I shouldn't have commented without looking into it more.