Add dark theme about materialteatimer HOT 4 OPEN

this is a bit more complicated - the pictures must look good against a dark background - otherwise goot suggestion

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The pictures could still be normal... or the edges of teas could be marked brighter to differenciate between dark UI and darker teas

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would look really bad with the current images as they have white backgrounds.I have some images with transparency - wanted to do this anyway - just time constraints ;-)

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Or replace the teas pictures with different colored cups/kettles (optionally from settings).

Or maybe a white picture could have rounded edges so it would look better in dark mode

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