Documentation for PL/Swift

This is the source repository for the PL/Swift documentation. Checkout the built results over here: https://pl-swift.github.io/docs/.

mkdocs setup

Yes, the setup of this is a little weird :-) It contains both the documentation sources (in the content folder) as well as the built site (in the docs folder). This is to please GitHub pages, if there is a better way to setup this, please let me know :-)