Menu bar icon should grey out when no network connectivity

[cekageka]

📝 Provide a description of the new feature

On macOS there’s a common best practice for menu bar items when there’s no network connectivity: the icons are simply greyed out. Only Gitify shows a red icon. It’s not critical, but it breaks the otherwise consistent behavior, and it would be great if Gitify also used a greyed-out icon instead of red.

➕ Additional Information

No response