Update notebook.py

notebook.py

@@ -27,7 +27,7 @@ def _(mo):
 
         One of the remarkable things about mathematical constants like $\pi$ is how frequently they arise in nature, in the most surprising of places.
 
-        Inspired by 3Blue1Brown, this marimo notebook shows how the number of collisions incurred in a particular system involving two blocks converges to the digits in $\pi$.
+        Inspired by 3Blue1Brown, this [marimo notebook](https://github.com/marimo-team/marimo) shows how the number of collisions incurred in a particular system involving two blocks converges to the digits in $\pi$.
 
         **Tip!**: Use the menu in the top right to reveal the notebook's code.
         """