Old GitLab repo listed in `Cargo.toml` file

[wheelerMT]

Maintenance task description

The repository listed in the Cargo.toml file links to the outdated GitLab repo:

https://github.com/nyx-space/nyx/blob/ef28f76f5a1c41d5c730fe880438a456010e710c/Cargo.toml#L10

This means that nyx crates.io page gives a link to an abandoned repo. Instead, it should point to this active GitHub repo.

Scope of work

• Update the line specified above to the correct GitHub repo, which will ensure the repository link is correct on the nyx crates.io page.
• Remove the gitlab section from under [badges].

Priority

Low.