Add first 6 talk materials received

Hi Tim,

This PR adds the first 6 talk materials I received. I converted the site to [Jekyll](https://github.com/mojombo/jekyll) because managing all those pages manually would be a bit boring. In case you want to change/add anything, just do it in the original files (i.e. not under `public/`), run `rake build` and the site will be regenerated under `public/`, from where you can deploy it just as before.