message: docs: remove vant-demo pages
diff: import Vue from 'vue';
  import docConfig from './doc.config';
  import DemoList from './components/DemoList';
  -import DemoPages from './components/DemoPages';
  import { demoWrapper } from './mobile/demo-common';
  import { initIframeRouter } from './utils/iframe-router';
  @@ -35,9 +34,7 @@ const registerRoute = ({ mobile, componentMap }) => {
  path = path.replace('/', '');
  let component;
  - if (path === 'demo') {
  - component = DemoPages;
  - } else if (mobile) {
  + if (mobile) {
  const module = componentMap[`./${path}/demo/index.vue`];
  if (module) {
  