Make an official Flatpak on Flathub

> @spectrapulse > You can't use prebuilt deb's and rpm's on immutable distros. I'm not sure about Debian based distro's but I know Fedora based images usually come with rpm-ostree which does work with rpm's.

It is strongly recommended to avoid and minimize the use of rpm-ostree on such distros, and some remove it entirely. Nobody here is advocating for removing native packages, only treating flatpak as a first class citizen alongside them. Most desktop systems where this would be used support flatpak, or can easily install it, and it dramatically reduces management for a maintainer to be able to target one distribution method. That said, once pipelines are built it's not usually a big deal to maintain multiple distribution methods and given that they support AppImage and didn't deprecate the packages I do not think there is any real risk of them deprecating packages. If anything has to be deprecated I'd prefer AppImage due to the problems and security issues with that format. But really nobody is calling for that either.