Have you tried run ./nodebb setup or ./nodebb build? It seems that it did't build the static files.
Nodebb and WordPress in the same VPS
Is it possible to install nodebb and wordpress in the same vps? How to do it?
Install nginx server
Install NodeBB for 1 website
Install wordpress for 2nd website
Use MongoDB for database
Use Redis for caching
Install control panel like VestaCP.
Configure all and create wesbite with WP.
Install mongoDB or redis and install NodeBB on subdomain.
Then configure nging proxy
Yes, with a VPS you can install whatever you want on it, much like your own desktop computer. Install WordPress, or Drupal, or Ghost, or whatever you want. As long as the VPS resources are enough to handle all of them running at once