Update notebook to use non-LFS airline dataset from repo root

Author: lisadunlap

starter_notebook.ipynb

@@ -64,7 +64,7 @@
    "execution_count": null,
    "metadata": {},
    "outputs": [],
-   "source": "# Load the JSONL data\n# Download the demo dataset (Git LFS file):\n# Option 1: Use curl to follow redirects\n# !curl -L https://media.githubusercontent.com/media/lisabdunlap/StringSight/main/data/taubench/airline_data_demo.jsonl -o airline_data_demo.jsonl\n\n# Option 2: Clone the repo with git lfs\n# !git clone https://github.com/lisabdunlap/StringSight.git\n# Then use: data_path = \"StringSight/data/taubench/airline_data_demo.jsonl\"\n\ndata_path = \"airline_data_demo.jsonl\"  # or use your own dataset path\ndf = pd.read_json(data_path, lines=True)\n\nprint(f\"Loaded {len(df)} conversations\")\nprint(f\"\\nColumns: {df.columns.tolist()}\")\ndf.head()"
+   "source": "# Load the JSONL data\n# Download the demo dataset:\n# !wget https://raw.githubusercontent.com/lisabdunlap/StringSight/main/airline_data_demo.jsonl\n\ndata_path = \"airline_data_demo.jsonl\"  # or use your own dataset path\ndf = pd.read_json(data_path, lines=True)\n\nprint(f\"Loaded {len(df)} conversations\")\nprint(f\"\\nColumns: {df.columns.tolist()}\")\ndf.head()"
   },
   {
    "cell_type": "markdown",