I looked into self-hosted wikis for our team earlier this year. Outline looked very promising, but as the author here mentioned, the documentation was indeed lacking. It seemed to me that they're more intent on pushing their paid plans.

Ultimately we landed on BookStack (https://www.bookstackapp.com/) and people in our org love it. Deployment instructions were pretty easy to follow for someone who doesn't do many server deployments, the UI is great, and the feature set is sufficient for our needs. Plus, the lead developer is extremely helpful in answering questions on Discord.