Safari now supports real favicons, and the existing icon was just a
solid circle which isn’t very clear.

Before/After:
<img width="139" alt="Screenshot_2023-04-03 14 05 06"
src="https://user-images.githubusercontent.com/25517624/229590886-b814d622-6780-4222-804c-edc84c43a2f6.png">
<img width="140" alt="Screenshot_2023-04-03 14 06 56"
src="https://user-images.githubusercontent.com/25517624/229591285-d808fa92-6141-4a23-8e50-e1f46e5b3d03.png">