Docs: add English language support (#170)

* feat: support lang entry build

* feat: vant support lang switch

* move lang iframe-router to utils & fix router link bug

* add en-US config && add some translation

* chang async. to async_ (support superman cdn)

* add layout translation

* change nav style

* upgrade zan-doc

* fix: doc config

* upgrade zan-doc && remove useless code

* fix changelog generate path

docs/src/index.js

@@ -3,16 +3,12 @@ import VueRouter from 'vue-router';
 import App from './ExamplesDocsApp';
 import routes from './router.config';
 import ZanDoc from 'zan-doc';
-import isMobile from './is-mobile';
+import isMobile from './utils/is-mobile';
 
 Vue.use(VueRouter);
 Vue.use(ZanDoc);
 
 const routesConfig = routes();
-routesConfig.push({
-  path: '/',
-  redirect: '/component/quickstart'
-});
 
 const router = new VueRouter({
   mode: 'hash',
@@ -30,7 +26,7 @@ router.beforeEach((route, redirect, next) => {
 
 router.afterEach(() => {
   window.scrollTo(0, 0);
-  window.syncPath();
+  Vue.nextTick(() => window.syncPath());
 });
 
 window.vueRouter = router;