add comments and headings to notebooks

Cleaning.ipynb

@@ -244,7 +244,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 17,
+   "execution_count": 7,
    "id": "24675f41-d48f-4e27-a3d8-e303556ee7d1",
    "metadata": {},
    "outputs": [],
@@ -254,7 +254,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 23,
+   "execution_count": 8,
    "id": "d7bf2c46-7885-4dfe-a4e7-8b8439cf0434",
    "metadata": {},
    "outputs": [],
@@ -264,14 +264,6 @@
     "os.makedirs('data', exist_ok=True)\n",
     "df.to_csv('./data/dataset_cleaned.csv', index=False)"
    ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": null,
-   "id": "ce134731-e15e-4a2a-aa4e-a28de45fd3af",
-   "metadata": {},
-   "outputs": [],
-   "source": []
   }
  ],
  "metadata": {
@@ -290,7 +282,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.11.5"
+   "version": "3.11.9"
   }
  },
  "nbformat": 4,