Archive this crate & repro

[repi]

The new pure-Rust rfd crate replaces this crate, so let's close this project!

Think we can do:

• Push out a release of this where we mark it in the README.md and Cargo.toml as unmaintained & recommend rfd
• Publish a RUSTSEC advisory about the same
• Archive this github repo

Anything else? We didn't have it listed on embark.dev/embark.rs as it was just a fork, otherwise we would have removed from there also.

[repi]

Looks like there aren't really anyone else using this, at least not with public dependencies on crates.io, but could be used in private crates and repositories (like we were).

https://crates.io/crates/nfd2/reverse_dependencies

[repi]

bump :)