The instructions don't explain how to set up an AppImage on Arch

The information here for Arch is,

> If you are seeing "fusermount: mount failed: Operation not permitted"
>
> sudo chmod u+s `which fusermount`

But this isn't the basic information we need. We first need to know that we have to manually install FUSE. And information on how to do this isn't given on the Arch wiki[](https://wiki.archlinux.org/title/FUSE) either (there, we're told only how to _unmount_ FUSE).