[feature] monochrome tray icon

[amigthea]

would be lovely to have a monochrome alternative for the tray icon, or maybe the ability to set a custom one from app option (without the need to change it from source)

[amigthea]

does this commit adds a monochrome version of the tray icon image? if so, how can I select it?

[seird]

I'm not going to create new icons myself, you can now select custom tray icons: settings -> Appearance -> Custom Tray Icon

c83bf32

[amigthea]

if it can be helpful for someone, I'll leave here some tray icon variations I made based on the gotify repository notification icon

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