docs: update

README.md

@@ -37,6 +37,7 @@
 
 - [Sim 在线预览](https://nav3.cn/#/sim)
 - [Light 在线预览](https://nav3.cn/#/light)
+- [Side 在线预览](https://nav3.cn/#/side)
 
 ![Preview](https://raw.githubusercontent.com/xjh22222228/public/gh-pages/nav/1.png)
 ![Preview](https://raw.githubusercontent.com/xjh22222228/public/gh-pages/nav/2.png)

src/view/index/side/index.component.html

 <nz-layout class="layout">
   <nz-layout>
-    <nz-sider nzWidth="200px" nzTheme="light" class="sider">
+    <nz-sider nzWidth="200px" nzTheme="light" class="sider dark-scrollbar">
       <div class="logo dark-bg">
         <img src="assets/logo.png" alt="发现导航nav3.cn">
         <span class="site-title">{{ title }}</span>