Ensure cross-platform support

[fritzrehde]

The primary target of this project is currently Linux, but, ideally, I would also like to support other platforms. Currently, we are already generating binaries for Windows and MacOS (through cargo-dist), but I have not tested whether those work (very much). Most of the major dependecies we use (clap, ratatui, crossterm) should be cross-platform compatible, so cross-platform support seems possible. Further down the line, I would like to implement some sort of automated tests for each platform that ensure everything works well, but for now, just checking (maybe in virtual machines from my linux desktop) by hand that everything works would be great.