improve dev server startup time

docs/gridsome.server.js

@@ -75,7 +75,7 @@ module.exports = function (api) {
 
     config.module
       .rule('jsx')
-      .test(/\.jsx?$/)
+      .test(/\.jsx$/)
       .use()
       .loader('babel-loader')
 

docs/src/components/ReactRenderer/index.vue

@@ -1,5 +1,5 @@
 <template>
-  <div></div>
+  <div />
 </template>
 
 <script>

docs/src/demos/React/components/Editor.jsx

@@ -1,4 +1,4 @@
-import {
+import React, {
   useState, useRef, useEffect, createContext, useContext,
 } from 'react'
 import { Editor as Tiptap } from '@tiptap/core'

docs/src/demos/React/index.jsx

@@ -1,4 +1,4 @@
-import { useState } from 'react'
+import React, { useState } from 'react'
 import extensions from '@tiptap/starter-kit'
 import { useEditor, Editor } from './components/Editor'