Greetings! I have not had time to update this guide since the new NixOS release; Though, everything should still work the same way. Nevertheless, as you may be able to see from the screenshot below, a BIG upgrade is coming to this guide at some point.
However, I have not been able to work on it since June. I hope to have more free time to work on it again sooner than later, so, please bare with me and the old guide for a little while longer!