ADD comment to tell tutorial users they need to execute the cell

Author: Shotgunosine

index.ipynb

@@ -176,6 +176,9 @@
    ],
    "source": [
     "%%html\n",
+    "\n",
+    " <!–– TUTORIAL USERS: PLEASE EXECUTE THIS CELL ––>\n",
+    "\n",
     "<style>.container { width:75% !important; }</style>\n",
     "<link rel='stylesheet' type='text/css' href='static/css/mobile.css'>\n",
     "<link rel='stylesheet' type='text/css' href='static/css/homepage.css'>\n",