I really liked your design; not only were the colors to my taste, but, along with the contrast, they were gentle on my eyes; the pixelated font was a nice touch for the code samples as well. On the other hand, while still on accessory matters, I think "Nix: The only sane way to use Linux" would serve you better as a title.

Which brings me to: why Nix, specifically? Wouldn't Guix provide the same benefits — a declarative, reproducible, pinnable system – along with a potentially more pleasant language to code in, namely Scheme?