chore(cli): remove decamelize pkg for compatiblity issues

packages/vant-cli/site/mobile/components/DemoSection.vue

@@ -5,7 +5,7 @@
 </template>
 
 <script>
-import decamelize from 'decamelize';
+import { decamelize } from '../../common';
 
 export default {
   name: 'demo-section',
@@ -14,7 +14,7 @@ export default {
     demoName() {
       const { meta } = this.$route || {};
       if (meta && meta.name) {
-        return `demo-${decamelize(meta.name, '-')}`;
+        return `demo-${decamelize(meta.name)}`;
       }
 
       return '';

packages/vant-cli/site/mobile/router.js

@@ -1,7 +1,7 @@
 import Vue from 'vue';
 import VueRouter from 'vue-router';
-import decamelize from 'decamelize';
 import DemoHome from './components/DemoHome';
+import { decamelize } from '../common';
 import { demos, config } from 'site-mobile-shared';
 import { getLang, setDefaultLang } from '../common/locales';
 import '../common/iframe-router';
@@ -52,7 +52,7 @@ function getRoutes() {
   }
 
   names.forEach(name => {
-    const component = decamelize(name, '-');
+    const component = decamelize(name);
 
     if (langs.length) {
       langs.forEach(lang => {