Update app.py

fixed broken link

app.py

@@ -20,7 +20,7 @@ intro.markdown(
     """Healthsea is an end-to-end spaCy v3 pipeline for analyzing user reviews to supplementary products and extracting their potential effects on health."""
 )
 intro.markdown(
-    """The code for Healthsea is provided in this [github repository](https://github.com/thomashacker/healthsea). Visit our [blog post](https://explosion.ai/) or more about the Healthsea project.
+    """The code for Healthsea is provided in this [github repository](https://github.com/explosion/healthsea). Visit our [blog post](https://explosion.ai/) or more about the Healthsea project.
     """
 )