Also added katex preprocessor in book.toml for math eqs.
[book] authors = ["Udo Eisenbarth <u.eisenbarth@gsi.de>", "Yannik Zobus <y.zobus@gsi.de>"] language = "en" multilingual = false src = "src" title = "OPOSSUM Handbook" [preprocessor.katex] after = ["links"]
