Add the following line to /etc/nixos/configuration.nix
nix.settings.experimental-features = [ "nix-command" "flakes" ];
Run sudo nixos-rebuild switch to install flakes
Copy your hardware-configuration.nix and any new changes to your configuration.nix into your git repo for your nix config.
!! Don't use your old hardware-configuration.nix as varibles have changed.
sudo nixos-rebuild switch --flake ~/.nixos#razer14
darwin-rebuild switch --flake ~/.nixos#PNH46YXX3Y --show-trace
home-manager switch --flake ./#adriel