Move existing website code to Jekyll

Currently our website is running on my VPS, which is not ideal. I would prefer it if it would run on other infrastructure. The ideal place to run our (static) website would be Github pages. A while back Github had no support for sass and other compiled sources, [but since July 30th](https://github.com/blog/1867-github-pages-now-runs-jekyll-2-2-0) it does!

That's why I moved our current code over to a new Jekyll based theme.