Fixed website insecure asset load

docs/_static/mxnet-theme/navbar.html

@@ -1,51 +1,8 @@
-<!-- Previous Navbar Layout
-<div class="navbar navbar-default navbar-fixed-top">
-  <div class="container">
-    <div class="navbar-header">
-      <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#navbar" aria-expanded="false" aria-controls="navbar">
-        <span class="sr-only">Toggle navigation</span>
-        <span class="icon-bar"></span>
-        <span class="icon-bar"></span>
-        <span class="icon-bar"></span>
-      </button>
-      <a href="{{ url_root }}" class="navbar-brand">
-        <img src="http://data.mxnet.io/theme/mxnet.png">
-      </a>
-    </div>
-    <div id="navbar" class="navbar-collapse collapse">
-      <ul id="navbar" class="navbar navbar-left">
-        {% for name in ['Get Started', 'Tutorials', 'How To'] %}
-        <li> <a href="{{url_root}}{{name.lower()|replace(" ", "_")}}/index.html">{{name}}</a> </li>
-        {% endfor %}
-        {% for name in ['Packages'] %}
-        <li class="dropdown">
-          <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="true">{{name}} <span class="caret"></span></a>
-          <ul class="dropdown-menu">
-            {% for lang in ['Python', 'R', 'Julia', 'C++', 'Scala', 'Perl'] %}
-            <li><a href="{{url_root}}{{name.lower()|replace(" ", "_")}}/{{lang.lower()}}/index.html">
-                {{lang}}
-            </a></li>
-            {% endfor %}
-          </ul>
-        </li>
-        {% endfor %}
-        <li> <a href="{{url_root}}system/index.html">System</a> </li>
-        <li> {{searchform('', False)}} </li>
-      </ul>
-      <ul id="navbar" class="navbar navbar-right">
-        <li> <a href="{{url_root}}index.html"><span class="flag-icon flag-icon-us"></span></a> </li>
-        <li> <a href="{{url_root}}/zh/index.html"><span class="flag-icon flag-icon-cn"></span></a> </li>
-      </ul>
-    </div>
-  </div>
-</div>
-Previous Navbar Layout End -->
-
 <div class="navbar navbar-fixed-top">
   <div class="container" id="navContainer">
     <div id="header-inner" class="innder">
       <h1 id="logo-wrap">
-        <a href="{{ url_root }}" id="logo"><img src="http://data.mxnet.io/theme/mxnet.png"></a>
+        <a href="{{url_root}}" id="logo"><img src="{{url_root}}_static/mxnet.png"></a>
       </h1>
       <nav id="main-nav" class='nav-bar'>
         <a class="main-nav-link" href="{{url_root}}get_started/install.html">Install</a>