Broken link to `CODE_OF_CONDUCT.md`

[estebank]

The main site under Community > Main development has a link to the Code of Conduct on the ziglang/zig repo, but that file was deleted in ziglang/zig@4bb9aa9.

[nektro]

https://kristoff.it/blog/interfacing-with-zig/ might be a good document to use its place instead given the surrounding text.

[andrewrk]

Thanks, yeah I'm going to move that content to the website.