Restructure Darwin configuration

So far, this is just based on mightymac. The other devices will be
updated soon.

modules/hosts/darwin/mightymac/gene.liverman.nix

@@ -0,0 +1,30 @@
+{ username, ... }: {
+  home.stateVersion = "23.11";
+  imports = [
+    ../home.nix
+    ../../common
+    ../../common/all-gui.nix
+  ];
+
+  programs = {
+    go = {
+      enable = true;
+      goPath = "go";
+    };
+    k9s.enable = true;
+    zsh = {
+      initExtra = ''
+        eval $(brew shellenv)
+      '';
+    };
+  };
+
+  sops = {
+    defaultSopsFile = ./secrets.yaml;
+    secrets = {
+      i2cssh_config.path = "/Users/${username}/.i2csshrc";
+      local_git_config.path = "/Users/${username}/.gitconfig-local";
+      local_private_env.path = "/Users/${username}/.private-env";
+    };
+  };
+}