NixOS and Home-Manager configurations

Configurations for multiple machines.

NixOS

nixos-rebuild switch --flake .#desktop

nix-darwin (untested)

Switch,

nix build .#darwinConfigurations.<system>.system
./result/sw/bin/darwin-rebuild switch --flake .#<system>

Home-Manager (untested)

Switch home-manager,

home-manager switch -b backup --flake .#<configuration>

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There is a manual step necessary to get fish working on nix-darwin. Post rebuild run,

chsh -s /run/current-system/sw/bin/fish