Remove registration link for the Gerrit User Summit 2022

Change-Id: Ib2de631b4af4e549114eb01e9315fea6399ab7ef

navbar.md

diff --git a/navbar.md b/navbar.md
index 8a07568..62659b3 100644
--- a/navbar.md
+++ b/navbar.md
@@ -1,6 +1,5 @@
 # London (UK) - 10-11 November 2022
 
-* [**REGISTER**](https://www.eventbrite.co.uk/e/gerrit-user-summit-2022-tickets-424995963367)
 * [Home](/index.md)
 * [Location](/location.md)
 * [Schedule](/schedule.md)