The Artsy OSS page and the blog run on top of a default jekyll install. If you'd like an overview of jekyll their website rocks.
git clone git@github.com:artsy/artsy.github.io.git
cd artsy.github.io
rake bootstrap
rake build
Running rake serve will not generate category pages. They take a long time to generate. No one wants that when working on the site.
rake serve
Categories are generated when the ENV var PRODUCTION = "YES".
Travis CI will automatically deploy when new commits are pushed to the source branch, so you shouldn't need to deploy from your local computer. However, if you need to deploy locally, the rake deploy command is available.
TLDR
To generate a new post, create a new file in the _posts directory. Be sure to add your name as the author of the post and include a couple of categories to file the post under. Here's some sample header YAML:
---
layout: post
title: "Responsive Layouts with CSS3"
date: 2012-01-17 11:03
comments: true
author: Matt McNierney
github-url: https://www.github.com/mmcnierney14
twitter-url: http://twitter.com/mmcnierney
blog-url: http://mattmcnierney.wordpress.com
categories: [Design, CSS, HTML5]
---
More info can be found in the official docs.
When you have authored an article, git add and git commit it, then push to the source branch with git push origin source. To publish the post, you need to deploy the blog.