Remove "80s 90s Super Pop Hits" from default config

[hannesbraun]

This station seems to be no longer available. I think having an unavailable station in the default config doesn't make much sense. Or did the station just move elsewhere?

Also, I removed the note about macOS. I'm using radio-cli on macOS for over a year now without any issues.

On another note: if you plan to do a release btw, maybe you can bump the dependencies to their latest version first (or at least the version of the libc crate). I wasn't able to verify it (yet), but that should allow the program to be built for loongarch64 as well and I don't have to exclude that architecture in the Alpine Linux package.