This site contains all the presentations I give (well, the ones from "now on", that is). The reason behind having a presentation site, is that I don't have to forward any presentations in varying formats, generate PDF's from Keynote or PowerPoint etc.
I won't be taking contributions to the materials (that's at least not the plan, for now), but if you're interested in how "this works", and you want to tinker then have a look at the CONTRIBUTING.md-file.