Bonus: added a bit of helpful text to the notebook

middleschool-cardlist.ipynb

@@ -206,6 +206,13 @@
     "middleschool_df.to_csv('output/middleschool.csv')\n",
     "middleschool_df.to_json('output/middleschool.json')\n"
    ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "Feel free to delete everything in the `data` directory after you are done"
+   ]
   }
  ],
  "metadata": {