Automate checking liveness of links in the events section

[mariannegoldin]

[mre]

Maybe lychee can help with that. It's written in Rust and used by many organizations. There's also a GitHub action, which can be used to check links regularly.

Testing it is as simple as

 lychee content/2024-10-16-this-week-in-rust.md

from the project root.

Full disclosure: as one of the maintainers, I'm biased.