delete unused import

src/client/js/util/Crowi.js

@@ -3,8 +3,6 @@
  */
 
 import axios from 'axios';
-import React from 'react';
-import ReactDOM from 'react-dom';
 
 import InterceptorManager from '@commons/service/interceptor-manager';
 
@@ -14,7 +12,6 @@ import {
   DetachCodeBlockInterceptor,
   RestoreCodeBlockInterceptor,
 } from './interceptor/detach-code-blocks';
-import HandsontableModal from '../components/PageEditor/HandsontableModal';
 
 export default class Crowi {
   constructor(context, window) {