Merge branch 'make-cancellation-of-git-workshop-more-obvious' into 'master'

Make cancellation of git workshop more obvious

See merge request hifis/hifis.net!276

_events/2021/07/2021-07-26-version-control-using-git.md

 ---
-title: Version Control using Git
+title: Version Control using Git (CANCELLED)
 layout: event
 organizers:
   - belayneh