Refactored home configurations

Comon config is handled in `modules/home/home/default.nix`.

homes/x86_64-linux/alejandro/default.nix

@@ -1,27 +0,0 @@
-{...}: {
-  aa = {
-    apps = {
-      bat.enable = true;
-      btop.enable = true;
-      tmux.enable = true;
-    };
-
-    programs = {
-      firefox.enable = true;
-      fzf.enable = true;
-      gpg.enable = true;
-      kitty.enable = true;
-      zoxide.enable = true;
-      yazi.enable = true;
-    };
-
-    tools = {
-      direnv.enable = true;
-      eza.enable = true;
-      git.enable = true;
-      zsh.enable = true;
-    };
-
-    windowManagers.sway.enable = true;
-  };
-}

homes/x86_64-linux/alejandro@carbon/default.nix

@@ -0,0 +1,3 @@
+{...}: {
+  aa.isHeadless = false;
+}

homes/x86_64-linux/alejandro@gospel/default.nix

@@ -0,0 +1,3 @@
+{...}: {
+  aa.isHeadless = false;
+}

homes/x86_64-linux/alejandro@node/default.nix

@@ -0,0 +1,2 @@
+{...}: {
+}

modules/home/home/default.nix

@@ -1,7 +1,59 @@
 {
+  config,
   lib,
   osConfig ? {},
+  namespace,
   ...
 }: {
-  home.stateVersion = lib.mkDefault (osConfig.system.stateVersion or "24.05");
+  options.${namespace} = {
+    isHeadless = lib.mkOption {
+      type = lib.types.bool;
+      default = true;
+      description = "If true, graphical applications (e.g. firefox, sway, etc) won't be installed.";
+    };
+
+    installDefaults = lib.mkOption {
+      type = lib.types.bool;
+      default = true;
+      description = "If true, a default set of packages will be installed.";
+    };
+  };
+
+  config = lib.mkMerge [
+    (
+      lib.mkIf (!config.${namespace}.isHeadless) {
+        ${namespace} = {
+          programs.firefox.enable = true;
+          windowManagers.sway.enable = true;
+        };
+      }
+    )
+    (lib.mkIf (config.${namespace}.installDefaults) {
+      ${namespace} = {
+        apps = {
+          bat.enable = true;
+          btop.enable = true;
+          tmux.enable = true;
+        };
+
+        programs = {
+          fzf.enable = true;
+          gpg.enable = true;
+          kitty.enable = true;
+          zoxide.enable = true;
+          yazi.enable = true;
+        };
+
+        tools = {
+          direnv.enable = true;
+          eza.enable = true;
+          git.enable = true;
+          zsh.enable = true;
+        };
+      };
+    })
+    {
+      home.stateVersion = lib.mkDefault (osConfig.system.stateVersion or "24.05");
+    }
+  ];
 }