Include some programming language flag with the links, to show when the link is not only about javascript, and to help people who look for training another language.

A good solution to quickly deploy an environment for development or hackathon is to use Docker containers.

Why not use the docker compose tools to deploy multi containers with the Nodejs app and a Postgres database here?
Moreover, we can add a Makefile to help Docker newbie to run the environment, we can be inspired by this: https://gazr.io

The explanation on setting up a database works great if you have a user without password with the same name as your computer account. While this is the default for postgres, it would be great to have an explanation on setting up a connection with password!

In the off chance that someone saves a value to the Config UI and it takes down the site, there needs to be documentation on how to manually go in and resolve it (as a fallback).