Feature Request: Add Nix syntax highlighting

[pinpox]

I often share nix configurations and would like to have syntax highlighting for them. Any chance the language could be added to the list? Looked a bit at how to add languages but it wasn't obvious to me, if you give me any pointers how to do it I'll try to submit a PR myself

[matze]

Nix should be in the list for a while now. https://bin.bloerg.net runs a slightly older version at the moment but it has nix language support.

[pinpox]

My bad, I was looking at an instance with an older version.