FEAT: Make macOS app icon a rounded-rectangle to match Big Sur style guide

Is your feature request related to a problem? Please describe. The macOS app icon stands out a lot compared to other app icons. I have to manually change the icon each time to match the HIG.

Describe the solution you'd like Could you please update the app icon for macOS according to Big Sur specifications?

Describe alternatives you've considered

Additional context

More: https://developer.apple.com/design/human-interface-guidelines/app-icons#Platform-considerations

Production Templates: https://developer.apple.com/design/resources/#macos-apps

Database type, if appropriate