added google analytics pixel

src/app.py

@@ -91,6 +91,11 @@ def main():
                     st.code(str(transform))
                 show_credentials()
 
+                # adding google analytics pixel
+                # only when deployed online. don't collect statistics of local usage
+                if 'GA' in os.environ:
+                    st.image(os.environ['GA'])
+
 
 if __name__ == "__main__":
     main()