public function createCustomTheme($name, File $file)
    {
        $theme = new Theme();
        $theme->setName($name);
        $themeDir = "{$this->themeDir}/{$theme->getNormalizedName()}";

        $fs = new Filesystem();
        $fs->mkdir($themeDir);

        $file->move($themeDir, 'bootstrap.css');

        $this->om->persist($theme);
        $this->om->flush();
    }