修改doc实现

docs/_sidebar.md

@@ -1,2 +1,2 @@
 * [Home](README.md)
-* [Guide](first.md)
+* [Demo](http://htmlpreview.github.io/?https://github.com/215566435/React-dragger-layout/blob/master/build/index.html)

docs/first.md

@@ -1,2 +0,0 @@
-# dasdasd
-ddd

docs/index.html

@@ -13,7 +13,7 @@
   <script>
     window.$docsify = {
       loadSidebar: true,
-      name: 'dragact',
+      name: 'Dragact',
       subMaxLevel: 2,
       repo: ''
     }