readme: links to subrepos don't work

[bertsky]

I get a 404 if I click on one of the links in the left column, e.g.

https://github.com/JKamlah/ocr-model-catalogue/blob/main/data/german-print/data/tesseract/best/german_print

Am I correct in assuming everything here is generated automatically via some uploader script? Perhaps the direct subrepo link could be used instead. (Also, the wiki link could be made into a short hyperlink.)