add sidebar dinky logo

docs/index.html

@@ -20,6 +20,7 @@
 <div id="app">加载中</div>
 <script>
     window.$docsify = {
+      logo: '_media/dinky_side.jpg',
       name: '<span>Dinky</span>',
       nameLink: {
         '/en-US/': '/',