update docs

docs/index.html

@@ -19,7 +19,10 @@
     <section class="main">
         <div class="part-left">
             <header class="header">
-                <a href="./" class="logo">Artplayer.js</a>
+                <a href="./" class="logo">
+                    <img src="./assets/img/logo.png" height="20" alt="">
+                    Artplayer.js
+                </a>
                 <div class="menus">
                     <div class="item has-sub-menu">
                         Ecosystem