I'm working on a Flask deployment starter that makes it easy to get a production environment up and running on the likes of Digital Ocean / AWS Lightsail / OVH (i.e. cheap VPS environments). I haven't written documentation for it yet, but the code is up

https://github.com/johnwheeler/flask-live-starter

It includes tasks to provision a full Debian box with Gunicorn and Postgres, deploy your app, provision a letsencrypt certificate, backup your database, and tail your remote logs.