Add Gluon crash course into frontpage

docs/_static/mxnet-theme/index.html

@@ -20,23 +20,22 @@
 <div class="section-tout">
   <div class="container">
     <div class="row">
+      <div class="col-lg-4 col-sm-12">
+        <h3>A 60-minute Gluon Crash Course</h3>
+        <p>Check out our quick overview of how to use Gluon, the imperative interface of MXNet.</p>
+        <a href="http://gluon-crash-course.mxnet.io/">Learn More</a>
+      </div>
       <div class="col-lg-4 col-sm-12">
         <h3>MXNet 1.2.0.rc0 Released</h3>
         <p>We're excited to announce the release of MXNet 1.2.0.rc0! Check out the release notes for latest updates.</p>
         <a href="https://cwiki.apache.org/confluence/display/MXNET/Apache+MXNet+%28incubating%29+1.2.0+Release+Notes">Learn More</a>
       </div>
-      <div class="col-lg-4 col-sm-12">
-        <h3>Improved ONNX Support</h3>
-        <p>MXNet now supports importing ONNX models natively with the new ONNX-MXNet API. Try out the super resolution example, or a tutorial on fine-tuning an ONXX model with Gluon. 
-        </p>
-        <a href="api/python/contrib/onnx.html#onnx-tutorials">Learn More</a>
-      </div>
       <div class="col-lg-4 col-sm-12">
           <h3>Introducing the Scala Inference API</h3>
           <p>A model loading and inference API is now available for Scala developers. Try out the examples for single shot detection and loading models for image classification.
           </p>
           <a href="api/scala/index.html">Learn More</a>
-        </div>
+      </div>
     </div>
   </div>
 </div>