Remove reference to the Hackathon

This year the Gerrit User Summit will not have
a F2F Hackathon because of COVID-19 restrictions.

Change-Id: Ic61dff3a0628654061d303581d1b69a96c114b17
diff --git a/index.md b/index.md
index 074d9b6..9429b3e 100644
--- a/index.md
+++ b/index.md
@@ -8,7 +8,7 @@
 
 ## A Virtual Summit
 
-The Gerrit Virtual User Summit & Hackathon 2021 will be held online only,
+The Gerrit Virtual User Summit 2021 will be held online only,
 to allow most of the community around the globe to attend and share their
 experience and ideas, and avoid the problems with the travelling restrictions
 due to the [COVID-19 pandemic](https://en.wikipedia.org/wiki/COVID-19).