I don't know if Zeit Now (while really cool!) would work for NodeBB... NodeBB is a web application, and does lots of stuff in the background that relies on a server running. To have a service that spins up whenever a request comes in would be much too slow, if only because that first spin up would take many seconds!
Since, Nodebb is a Single page application. I want to know if there are any out of the box methods used for SEO. My forum is indexed by google. But there seems some problem for google to fetch all pages in my forum.
Do i need to manually add prerender.io to my nodebb app?
You shouldn't have to do anything. It's crawling all of my pages fine. How do you know it's having trouble crawling your site?