removing Rust: Writing a Command Line Tool in Rust

[Nixo0725]

https://mattgathu.dev/2017/08/29/writing-cli-app-rust.html no longer work

[lxcj]

If this one is removed, as a PR was submitted, it is available on archive.org:
https://web.archive.org/web/20260426191747/https://mattgathu.dev/2017/08/29/writing-cli-app-rust.html