feat(nix): add a first nix, nix-darwin, and home-manager setup

nix/home/default.nix

@@ -0,0 +1,33 @@
+{ pkgs, config, lib, home-manager, ... }:
+
+let
+  isDarwin = pkgs.stdenv.isDarwin;
+in
+{
+  # https://nix-community.github.io/home-manager/options.html
+  imports = [
+    ./skhd
+    ./yabai
+  ];
+
+  config = {
+    home.stateVersion = "23.05";
+
+    # Let Home Manager install and manage itself.
+    programs.home-manager.enable = true;
+
+    # TODO: First migrate all fonts
+    # fonts.fontconfig.enable = true;
+
+    # The home.packages option allows you to install Nix packages into your
+    # environment.
+    home.packages = with pkgs; [
+      nixpkgs-fmt
+      ripgrep
+    ];
+
+    home.sessionVariables = {
+      EDITOR = "vim";
+    };
+  };
+}