content/events: remove link to August installfest on events landing page

Author: jhenstridge

content/events/calendar.md

@@ -5,8 +5,6 @@ build:
   list: false
 ---
 
-### New [August Installfest](2025/installfest/index.md)
-
 We use the Google calendar (below) and [meetup](https://www.meetup.com/Perth-Linux-Users-Group-PLUG) to plan our events please look at those for specific events and details.
 
 Generally, PLUG runs a talk once a month at [Spacecubed](https://www.spacecubed.com/) along with a meetup in a local pub once every two months and a quiz night with prizes once a year around April or May.