feat(scratch_notebooks): add notebook to demonstrate URL markdown issue

- Added a new Jupyter notebook `url-markdown-issue.ipynb` in the `scratch_notebooks` directory. This notebook includes a demonstration of handling URLs within markdown strings using the Panel library.

refactor(scratch_notebooks): remove obsolete cache prototype notebook

- Removed the `cache.ipynb` notebook from the `scratch_notebooks` directory as it was deemed obsolete and no longer necessary for the project's current scope.

scratch_notebooks/url-markdown-issue.ipynb

@@ -0,0 +1,58 @@
+{
+ "cells": [
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "%load_ext autoreload\n",
+    "%autoreload 2"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "import panel as pn\n",
+    "\n",
+    "\n",
+    "string = \"hey, this is a [URL](https://www.google.com). Can you see it?\"\n",
+    "\n",
+    "\n",
+    "async def generate_text(msg, user, instance):\n",
+    "    m = \"\"\n",
+    "    for s in string:\n",
+    "        m += s\n",
+    "        yield m\n",
+    "\n",
+    "\n",
+    "chat = pn.chat.ChatInterface(callback=generate_text, callback_exception=\"verbose\")\n",
+    "chat.servable()"
+   ]
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "llamabot",
+   "language": "python",
+   "name": "python3"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 3
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython3",
+   "version": "3.11.8"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 2
+}