Merge pull request #2677 from jtpio/custom-widget-tutorial

Remove notebook specific custom widget tutorial

Author: jasongrout

docs/source/examples/Index.ipynb

@@ -38,7 +38,6 @@
     "- [Widget List](Widget%20List.ipynb)  \n",
     "- [Widget Styling](Widget%20Styling.ipynb)\n",
     "- [Layout Templates](Layoutt%20Templates.ipynb)\n",
-    "- [Widget Custom](Widget%20Custom.ipynb)\n",
     "- [Widget Asynchronous](Widget%20Asynchronous.ipynb): how to pause and listen in the kernel for widget changes in the frontend."
    ]
   },