Initialize repo, save dustinlyons custom config as rich-demo template, add my custom config to root

This PR initializes my nixos-config repo by saving dustinlyons custom config to a rich-demo template, adding the starter template to the root of the repo to replace it, then adding my custom config to the root. I made my custom config changes based on the starter template before setting up the repo so this allows me to see the changes I made to my custom config in relation to the starter template.