Major config overhaul: use custom modules, setup for multi-host config, and less boilerplate

modules/system/security/automount/default.nix

@@ -0,0 +1,17 @@
+{ config, lib, ... }:
+
+let
+  cfg = config.systemSettings.security.automount;
+in {
+  options = {
+    systemSettings.security.automount = {
+      enable = lib.mkEnableOption "Enable automount";
+    };
+  };
+
+  config = lib.mkIf cfg.enable {
+    services.devmon.enable = true;
+    services.gvfs.enable = true;
+    services.udisks2.enable = true;
+  };
+}