Based almost entirely on the dotfiles provided by Sherub Thakur at https://github.com/sherubthakur
See his full setup at https://www.reddit.com/r/unixporn/comments/j50g3n/xmonad_onearcdark/
configuration.nix is the one that lives in /etc/nixos/configuration.nix and does not live in the home directory
home-manager is required
