update intro page

sotopia/ui/streamlit_ui/pages/intro.py

@@ -6,6 +6,8 @@
     Sotopia is a place where you can create and explore social interactions between agents. 
     You can build your own **agents**, **scenarios**, and **evaluation dimensions**.
     Then try out your ideas and evaluate the results with your custom settings.
+    For more interesting projects using Sotopia, check out [our website](https://sotopia.world).
+    Also checkout the code [here](https://github.com/sotopia-lab/sotopia).
     """
 )