Adding instructions for existing codespace

docs/30-dev-env/2-dev-setup.mdx

@@ -2,11 +2,15 @@ import Screenshot from "@site/src/components/Screenshot";
 
 # 👐 Setup dev environment
 
-:::caution
-If you are doing this lab as part of a MongoDB GenAI Developer Day, at this point you should already have the GitHub Codespace ready for this lab, so you can skip the following steps and continue using the Codespace you created previously.
+<details>
+  <summary>🦹 If you are doing this lab as part of a MongoDB GenAI Developer Day, you can continue in the Codespace you previously created.</summary>
 
-If you haven't created a Codespace yet, follow the steps below to create one.
-:::
+    Navigate to your existing Codespace and click on the file named `ai-rag-lab.ipynb` under the Explorer.
+
+    This is the Jupyter Notebook you will be using throughout this lab.
+
+    <Screenshot url="https://github.com/codespaces" src="img/screenshots/30-dev-env/2-dev-setup/2-nav-notebook.png" alt="Navigate to the notebook" />
+</details>
 
 ## Option 1: GitHub Codespaces