add pointer to the updated notebook

Author: fedorov

notebooks/labs/idc_rsna2023.ipynb

@@ -10,6 +10,20 @@
         "<a href=\"https://colab.research.google.com/github/ImagingDataCommons/IDC-Tutorials/blob/master/notebooks/labs/idc_rsna2023.ipynb\" target=\"_parent\"><img src=\"https://colab.research.google.com/assets/colab-badge.svg\" alt=\"Open In Colab\"/></a>"
       ]
     },
+    {
+      "cell_type": "markdown",
+      "source": [
+        "# This notebook is outdated!\n",
+        "\n",
+        "\n",
+        "\n",
+        "\n",
+        "# Please see https://github.com/ImagingDataCommons/IDC-Tutorials/blob/master/notebooks/getting_started/part2_searching_basics.ipynb to learn about using `idc-index`"
+      ],
+      "metadata": {
+        "id": "SY0MuYztZhoR"
+      }
+    },
     {
       "cell_type": "markdown",
       "source": [