added reference to dim reduction app

app.py

@@ -230,6 +230,10 @@ def main():
     hundreds (e.g. 300 or 768) of AI-derived numbers.
     
     We'll take a look at those examples as well later on.
+    
+    Techniques used to visualise those high-dimensional vectors are called
+    dimensionality reduction techniques. If you would like to see this in action, check out
+    [this app](https://huggingface.co/spaces/jphwang/reduce_dimensions).
     """)
 
     st.markdown("""