Hmm. I'm not sure I'd want to rely on NodeJS for something as important as a wiki, also I see it uses MySQL if you don't want to use SQLite - but does it support PostgreSQL? Also can you use Markdown? Personally I quite like GitLabs built in wiki which while basic is great as you can just clone the simple git repo which is purely markdown files which is lovely to distribute around various machines, you can also gem install gollum on your local machine and have a git version controlled, offline markdown editor interface that can commit back to the central repo.
Neat, in need of a wiki for a project. Will check this one out.
As a sidenote, based on the name I originally thought this was an extension or a nephew product to mattermost[1].