Make the German Regulations a branch of wca-documents.

In order to automate the translations, it's much better to have each translation be a fork/branch of the original one. This merge commit does that.

The current regulation source files also need to be int he top-level directory, which this commit also moves those files to.

If you accept this pull request, I can easily re-generate the German regulations HTML if there are any changes to this repo.