Add link to the CLI working group's GitHub repository

[8573]

Currently, the page for the CLI working group does not link to a coordination repository for that working group:
https://www.rust-lang.org/governance/wgs/cli

There is a GitHub organization @rust-cli that claims to be the CLI working group and has this repository:
https://github.com/rust-cli/team

That seems to be the repository to which the working group's page on RLO should link, unless @rust-cli is fake and somehow impersonating the working group (despite appearing to have the real working group's participants).

Linking to the repository can help users trust that @rust-cli is not fake, without needing to compare the participants.

(Edited to add: I am not in a position to verify that @rust-cli is the real working group; "appearing to have the real working group's participants" reflected only a casual inspection by an outsider to the Rust team.)