Release notes are up!

I wish it went without saying, but these notes are completely written by hand.

https://ziglang.org/download/0.16.0/release-notes.html

0.16.0 Release Notes ⚡ The Zig Programming Language

@andrewrk Congrats on the release! I think the Io interface design turned out great, it works really well

Q: Should the link to zig-bootstrap in the release notes not point to Codeberg?

@Curve25519 fixed, thank you