Add blueprints and fake content

kirby/config/sections/mixins/layout.php

@@ -3,10 +3,12 @@
 return [
     'props' => [
         /**
-         * Section layout. Available layout methods: `list`, `cards`.
+         * Section layout.
+         * Available layout methods: `list`, `cardlets`, `cards`.
          */
         'layout' => function (string $layout = 'list') {
-            return $layout === 'cards' ? 'cards' : 'list';
+            $layouts = ['list', 'cardlets', 'cards'];
+            return in_array($layout, $layouts) ? $layout : 'list';
         }
     ]
 ];