Remove the demo page for new controllers

Author: javiereguiluz

src/Resources/skeleton/controller/ControllerWithTwig.tpl.php

@@ -13,7 +13,6 @@ class <?= $controller_class_name ?> extends Controller
      */
     public function index()
     {
-        // replace this line with your own code!
-        return $this->render('@Maker/demoPage.html.twig', [ 'path' => str_replace($this->getParameter('kernel.project_dir').'/', '', __FILE__) ]);
+        return $this->render('your_own_template.html.twig');
     }
 }