How to use it:
# If you're only wanted to use the dotfiles
$ ./bake switch-hm
# Optionally, you can register HM to gcroots
$ ./bake init-hm-gcroots
# Otherwise
$ ./bake list-nixos # List NixOS configuration
# ./bake switch-nixos [config] # Switch to [config] NixOS configuration
# ./bake boot-nixos [config] # Switch to [config] NixOS configuration at boot
$ ./bake list-nix-on-droid # List nix-on-droid configuration
$ ./bake switch-nix-on-droid [config] # Switch to [config] nix-on-droid configuration