code: private function purgeOldFiles(string $webDir): void
      {
          if (file_exists($webDir.'/app_dev.php')) {
              $this->fs->remove($webDir.'/app_dev.php');
              $this->io->writeln('Deleted the <comment>web/app_dev.php</comment> file.');
          }
  
          if (file_exists($webDir.'/install.php')) {
              $this->fs->remove($webDir.'/install.php');
              $this->io->writeln('Deleted the <comment>web/install.php</comment> file.');
          }
      }
docs: Purges old entry points.