This website is generated using the nanoc gem. It also uses rainpress to compress the CSS files. To install, type:

gem install nanoc rainpress mime-types

You can then run:

nano compile

to generate the final version. You can also see your changes as they happen by running:

nanoc autocompile

This will cause nanoc to recompile every time a file in the current directory changes. Look in the output/ directory for the built product.

You can learn more about nanoc at http://nanoc.stoneship.org/