Show links to blogs and their latest post.

[m-ou-se]

This makes the generator show file: urls to the main page and the latest post of both blogs:

$ cargo r -q
Inside Rust Blog: file:///home/mara/dev/blog.rust-lang.org/site/inside-rust/index.html
└─ Latest post: file:///home/mara/dev/blog.rust-lang.org/site/inside-rust/2022/05/26/Concluding-events-mods.html

Rust Blog: file:///home/mara/dev/blog.rust-lang.org/site/index.html
└─ Latest post: file:///home/mara/dev/blog.rust-lang.org/site/2022/05/19/Rust-1.61.0.html

Depending on how cool your terminal is, these might appear as clickable links.

[rylev]

Looks good to me, but I think this doesn't quite work on Windows.

[rylev]

🎉