cleanup langchain data load (#107)

* cleanup langchain data load

* fix: `arango_datasets` import

* expand notebooks

* expand (again)

* run `nbstripout`

Author: aMahanna

notebooks/ArangoDB_101.ipynb

@@ -823,7 +823,7 @@
    "source": [
     "# (~70k nodes, ~400 edges)\n",
     "\n",
-    "from arango_datasets.datasets import Datasets\n",
+    "from arango_datasets import Datasets\n",
     "\n",
     "Datasets(db).load(\"OPEN_INTELLIGENCE\")\n",
     "\n",