Update navigation.html

docs/_includes/navigation.html

@@ -2,7 +2,7 @@
 	<nav class="well sidebar-nav">
 		<ul class="nav nav-list">
 			<li class="nav-header"><img class="imageLink" src="{{ "/images/home.png" | prepend: site.baseurl }}?{{ site.time | date: "%Y%m%d%H%M" }}" alt="MaxKey" border="0"/> MaxKey</li>
-			<li class=""><a href="{{site.baseurl}}/index.html"><span class="none"></span>About关于</a></li>
+			<li class=""><a href="{{site.baseurl}}/welcome.html"><span class="none"></span>About关于</a></li>
 			<li class=""><a href="{{site.baseurl}}/tutorial.html"><span class="none"></span>快速使用</a></li>
 			<li class="nav-header"><img class="imageLink"  src="{{ "/images/cog.png" | prepend: site.baseurl }}?{{ site.time | date: "%Y%m%d%H%M" }}"  alt="配置" border="0">配置</li>
 			<li class=""><a href="{{site.baseurl}}/configuration.html"><span class="none"></span>基本配置</a></li>