feat: add 'comms' module

home/modules/comms/signal.nix

@@ -0,0 +1,13 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+{
+  config = lib.mkIf config.comms.signal.enable {
+    home.packages = with pkgs; [
+      (if config.lib ? nixGL then config.lib.nixGL.wrap signal-desktop else signal-desktop)
+    ];
+  };
+}