beat tracking; split notebooks

index.html

@@ -356,6 +356,7 @@ div#notebook {
 <div class="text_cell_render border-box-sizing rendered_html">
 <ol>
 <li><a href="segmentation.html">Segmentation</a> (<a href="segmentation.ipynb">ipynb</a>)</li>
+<li><a href="beat_tracking_essentia.html">Beat Tracking in Essentia</a> (<a href="beat_tracking_essentia.ipynb">ipynb</a>)</li>
 </ol>
 
 </div>

index.ipynb

@@ -123,7 +123,8 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "1.  [Segmentation](segmentation.html) ([ipynb](segmentation.ipynb))"
+    "1.  [Segmentation](segmentation.html) ([ipynb](segmentation.ipynb))\n",
+    "1.  [Beat Tracking in Essentia](beat_tracking_essentia.html) ([ipynb](beat_tracking_essentia.ipynb))"
    ]
   },
   {