Add Fedora installation instructions

[hroncok]

cc @decathorpe

This is still in the process of being available, so don't merge yet, please. I'll mark this as ready for review once the command actually works on Fedora 34.

[hroncok]

The command now actually works on Fedora 34.

[brettcannon]

@hroncok I just got back from vacation, but this is in my review queue so I will get to it.

But I did want to ask you and @decathorpe if #146 would make your lives easier by having a .deb config for something like https://github.com/mmstick/cargo-deb live in the repo itself? Or is it not really helpful to you in the end? The key thing for me is having someone help verify the file doesn't accidentally break since a .deb file isn't how I'm installing the Launcher for myself.

[decathorpe]

Our Rust packaging tools work almost exactly how cargo works without "special sauce" or configuration files (basically only "cargo install", with very basic configuration to tell it where to look for crate dependencies, and where to copy installed binaries), so adding configuration files to crate sources directly is not necessary for us.

Also we're dealing with RPM packages here, so I can't really help with deb stuff at all :)

[brettcannon]

Sorry about the distro confusion! Long day of catch-up after vacation 😅

[brettcannon]

Thanks for getting this into Fedora!