Unified home and system modules!

modules/app/spotify.nix

@@ -0,0 +1,15 @@
+{ config, lib, pkgs, ... }:
+
+let
+  cfg = config.samfelag.modules.app.spotify;
+in
+{
+  options.samfelag.modules.app.spotify = {
+    enable = lib.mkEnableOption "spotify";
+  };
+  config = lib.mkIf cfg.enable {
+    hm.home.packages = with pkgs; [
+      spotify
+    ];
+  };
+}