Make an official Flatpak on Flathub

(#948) Feature Shipped packaging

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Comment by @UnRealxInferno
RexSystem 1 vote originally by @UnRealxInferno on GitHub 1 reply
AppImages and RPMs are quite literally the easiest package formats to use, what? +1 for flatpak though.
Comment by @lonjil
RexSystem 1 vote originally by @lonjil on GitHub
AppImages aren't portable. E.g. the Fluxer AppImage doesn't work on my Linux computer. But Flatpak apps run fine.