Improve documentation
Currently there are a couple of different PDF files within the Koko documentation, but 1) they are mostly in German and 2) it's not always clear how they all fit together and which file describes what.
Some specific issues:
KoKo_Metadaten_Personen.pdf seems to be some kind of vocabulary of possible values for metadata. But it would be nice if there was more context in that file than just this list. It's also not clear what AHS and BHS mean.
The larger tables as, for example, in KoKo_Annotation_Interpunktion.pdf could benefit from a different format than PDF which is more suited to large tables.