Remove repo activity in README (#559)

The Repo Activity chart in the README pretty much is duplicate
information that GitHub provides in the Insights.

Signed-off-by: Eric Brown <ericwb@users.noreply.github.com>

README.rst

@@ -59,9 +59,3 @@ Example result:
 
 .. image:: https://raw.githubusercontent.com/securesauce/precli/main/images/example.gif
     :alt: Example output
-
-Repo Activity
--------------
-
-.. image:: https://repobeats.axiom.co/api/embed/e7b91dc06cef0f5076264bc799a37fc4b7eed186.svg
-    :alt: Repobeats analytics image