Having a shared system-wide config file is useful in many Grandpa Unix scenarios, like shared [shell account](https://en.wikipedia.org/wiki/Shell_account) boxes. This is major retro nerd chic! 🐡 🧐
`nim` would be in `/usr/local/bin` on most BSDs, or `/usr/pkg/bin` or `/opt/pkg` on PkgSrc systems, etc. [getSystemConfigPath](https://github.com/nim-lang/Nim/blob/4becd5a2a8d67c7481af457d5007e1a313d454c8/compiler/nimconf.nim#L225) could dig harder...
