Add blueprints and fake content

kirby/config/api/routes/site.php

@@ -51,12 +51,17 @@ return [
             'site/blueprints',
             /**
              * @deprecated
-             * @todo remove in 3.6.0
+             * @todo remove in 3.7.0
              */
             'site/children/blueprints',
         ],
         'method'  => 'GET',
         'action'  => function () {
+            // @codeCoverageIgnoreStart
+            if ($this->route->pattern() === 'site/children/blueprints') {
+                deprecated('`GET site/children/blueprints` API endpoint has been deprecated and will be removed in 3.7.0. Use `GET site/blueprints` instead.');
+            }
+            // @codeCoverageIgnoreEnd
             return $this->site()->blueprints($this->requestQuery('section'));
         }
     ],