Thanks to an awesome contribution by @iamlisaross, VersionPress has a brand new documentation:

The highlights are:

• The site is now statically generated by MkDocs and hosted on GitHub Pages. We'll no longer need to maintain the versionpress/docs-site Node.js app 🎉.
• Developer documentation is now part of the docs, see e.g. plugin support.
• Each page has an edit button which creates a GitHub pull request.
• The site has useful features like pressing “s” for search.

You can see all the details in PR #1334, it's an awesome job for the first-time contribution. Thanks again, Lisa!