I was thinking Vapid is like http://getlektor.com and is a static renderer with a built-in admin UI. But you maybe correct that node.js is serving the files.
I loved lektor when it first came on the scene...but can't recall why I stopped using it. The concept is great: admin UI that outputs static files! For some reason, i stopped using it, and the last couple of years have been using hugo...maybe i should revisit lektor. Thanks for this reminder!