organisation + move config for all devices to 'global' counterparts

modules/home-manager.nix

@@ -0,0 +1,16 @@
+{
+  inputs,
+  pkgs,
+  ...
+}: {
+  environment.systemPackages = with pkgs; [
+    inputs.home-manager.packages.${system}.default
+  ];
+
+  home-manager.backupFileExtension = ".bak";
+
+  home-manager.sharedModules = [
+    inputs.plasma-manager.homeManagerModules.plasma-manager
+    inputs.zen-browser.homeModules.beta
+  ];
+}