Remove README/requirements.txt and inline pip install in notebook

Move required dependencies (matplotlib, seaborn) into a pip install
cell in the notebook. Remove README and requirements.txt from tracking.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: mvansegbroeck

nemo/data-flywheel/e2e-llm-evaluation/README.md

@@ -30,6 +30,13 @@
     "## ⚙️ Setup"
    ]
   },
+  {
+   "cell_type": "code",
+   "source": "!pip install matplotlib seaborn",
+   "metadata": {},
+   "execution_count": null,
+   "outputs": []
+  },
   {
    "cell_type": "code",
    "execution_count": null,
@@ -718,4 +725,4 @@
  },
  "nbformat": 4,
  "nbformat_minor": 4
-}
+}