remove quiz preview from design page

src/pages/DesignPage/DesignPage.tsx

@@ -80,7 +80,6 @@ export const DesignPage = ({ heightSidebar, mobileSidebar }: Props) => {
         follow={followNewPage}
         cancel={() => setShowConfirmLeaveModal(false)}
       />
-      {createPortal(<QuizPreview />, document.body)}
     </>
   );
 };