Fixing link to work in both rendered docs as well as notebooks. (#709)

examples/user_guide/Django_Apps.ipynb

@@ -4,7 +4,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "As the core user guides including the [Introduction](../getting_started/index.html) have demonstrated, it is easy to display Panel apps in the notebook, launch them from an interactive Python prompt, and deploy them as a standalone Bokeh server app from the commandline. However, it is also often useful to embed a Panel app in large web application, such as a Django web server. Using Panel with Django requires a bit more work than for notebooks and Bokeh servers.\n",
+    "As the core user guides including the [Introduction](../getting_started/Introduction.ipynb) have demonstrated, it is easy to display Panel apps in the notebook, launch them from an interactive Python prompt, and deploy them as a standalone Bokeh server app from the commandline. However, it is also often useful to embed a Panel app in large web application, such as a Django web server. Using Panel with Django requires a bit more work than for notebooks and Bokeh servers.\n",
     "\n",
     "To run this example app yourself, you will first need to install django 2 (e.g. `conda install \"django=2\"`)."
    ]