add a dark theme or better use the system theme

[promeneur]

Please add a dark theme or better use the system theme.

Thanks

openSuse 15.2
kde apps 20.12.1
plasma 5.20.5
frameworks 5.78.0

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[jessicaschilling]

Thanks - this is already open upstream in ipfs/ipfs-webui#1702, so closing to avoid duplication.