Update example notebook

binder/example.ipynb

@@ -7,6 +7,13 @@
     "# JupyterLab Classic"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Widgets"
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": null,
@@ -31,6 +38,13 @@
     "slider"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Rich Display"
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": null,
@@ -90,12 +104,30 @@
     "display(h)"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Installing additional prebuilt (federated) extensions\n",
+    "\n",
+    "Execute the following cell:"
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": null,
    "metadata": {},
    "outputs": [],
-   "source": []
+   "source": [
+    "!pip install jupyterlab-cell-flash"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "Then reload the page and run a couple of cells. The cells should now be flashing when they have finished executing!"
+   ]
   }
  ],
  "metadata": {