Add notebook 5a to main index page

index.ipynb

@@ -23,6 +23,7 @@
     "* Step 3. [Extract all road sign data from a single page](step3.ipynb)\n",
     "* Step 4. [Structure the data extraction as a function](step4.ipynb)\n",
     "* Step 5. [Store the data in a dataframe and save to disk](step5.ipynb)\n",
+    "* Step 5a. [Extra notebook to show how to split up images](step5a.ipynb)\n",
     "* Step 6. [Restructure the code for clarity](step6.ipynb)\n",
     "* Step 7. [Plotting, tiny stat analysis and improved I/O](step7.ipynb)\n",
     "* Final. [Support for multiple pages](final.ipynb)\n",
@@ -38,15 +39,6 @@
     "\n",
     "These pages are in [Jupyter Notebook](https://jupyter.org/)"
    ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": null,
-   "metadata": {
-    "collapsed": true
-   },
-   "outputs": [],
-   "source": []
   }
  ],
  "metadata": {