icon: better app icon

- buttonized symbolic just doesn't cut it.
3 jobs for <span class="ref-name">wip/jimmac/appicon</span> in 1 minute and 10 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Test
passed #205882
flatpak

00:00:26

 
  Deploy
passed #205883
review

00:00:22

passed #205884
allowed to fail manual
stop_review

00:00:22