NixOS flake install script

• this is the script for automated setup for this NixOS starter configuration

• to start installation you can simply run:

nix-shell -p git --command "nix run --experimental-features 'nix-command flakes' github:foglar/nixos-config"
# or 
nix-shell -p git --command "nix run --experimental-features 'nix-command flakes' git+https://git.foglar.tech/foglar/dotfiles.git"