nixos+home: Add homemanager and nm-applet for easy network management

modules/services/networkmanager.nix

@@ -0,0 +1,7 @@
+{
+	flake.modules.nixos.networkmanager = {
+		networking.networkmanager = {
+			enable = true;
+		};
+	};
+}

modules/services/nm-applet.nix

@@ -0,0 +1,5 @@
+{
+  flake.modules.homeManager.nm-applet = {
+    services.network-manager-applet.enable = true;
+  };
+}