code: public function process(ContainerBuilder $container)
      {
          if (!$container->hasDefinition('fxp_block.extension')) {
              return;
          }
  
          $resources = $container->getParameter('fxp_block.twig.resources');
  
          array_splice($resources, 0, 0, [
              'block_div_layout.html.twig',
          ]);
  
          $container->setParameter('fxp_block.twig.resources', $resources);
      }
docs: {@inheritdoc}