Replaces all of the default providers in nbviewer with a simple URL rewrite for input of the form
https://mindtrove.info/<name> that renders a vanilla HTML page naming the page you entered. (You
have to use your imagination about what it might do instead.)
With docker installed, run:
make nbviewer
open http://localhost:8080
See the Dockerfile for how the provider is specified on the nbviewer command line.