docs: add integrations, revamp docs (#693)

Signed-off-by: Panos Vagenas <35837085+vagenas@users.noreply.github.com>

docs/examples/rag_haystack.ipynb

@@ -14,6 +14,17 @@
     "# RAG with Haystack"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "| Step | Tech | Execution | \n",
+    "| --- | --- | --- |\n",
+    "| Embedding | Hugging Face / Sentence Transformers | 💻 Local |\n",
+    "| Vector store | Milvus | 💻 Local |\n",
+    "| Gen AI | Hugging Face Inference API | 🌐 Remote | "
+   ]
+  },
   {
    "cell_type": "markdown",
    "metadata": {},
@@ -90,6 +101,7 @@
     "from docling_haystack.converter import ExportType\n",
     "from dotenv import load_dotenv\n",
     "\n",
+    "\n",
     "def _get_env_from_colab_or_os(key):\n",
     "    try:\n",
     "        from google.colab import userdata\n",
@@ -102,6 +114,7 @@
     "        pass\n",
     "    return os.getenv(key)\n",
     "\n",
+    "\n",
     "load_dotenv()\n",
     "HF_TOKEN = _get_env_from_colab_or_os(\"HF_TOKEN\")\n",
     "PATHS = [\"https://arxiv.org/pdf/2408.09869\"]  # Docling Technical Report\n",