made common configuration place for gnome extensions

modules/home-manager-modules/gnome.nix

@@ -0,0 +1,25 @@
+{
+  lib,
+  config,
+  ...
+}: {
+  options.gnome = {
+    extensions = lib.mkOption {
+      type = lib.types.listOf lib.types.package;
+      default = [];
+      description = "The set of extensions to install and enable in the user environment.";
+    };
+  };
+
+  config = {
+    home.packages = config.gnome.extensions;
+    dconf = {
+      settings = {
+        "org/gnome/shell" = {
+          disable-user-extensions = false; # enables user extensions
+          enabled-extensions = builtins.map (extension: extension.extensionUuid) config.gnome.extensions;
+        };
+      };
+    };
+  };
+}