The current guide for creating a CJK theme relies on the now deprecated asciidoctor-pdf-cjk-kai_gen_gothic gem which conflicts with Asciidoctor PDF 2. Since the guide was written, the noto-cjk project started publishing TTF fonts for the CJK languages. Rewrite the guide to explain how to use these fonts to create a custom theme.
Be sure to emphasize that TTF fonts are required. In my tests, CJK fonts that are created as OTF fonts do not work with Asciidoctor PDF. (In fact, OTF support in general is quite unreliable).
The current guide for creating a CJK theme relies on the now deprecated asciidoctor-pdf-cjk-kai_gen_gothic gem which conflicts with Asciidoctor PDF 2. Since the guide was written, the noto-cjk project started publishing TTF fonts for the CJK languages. Rewrite the guide to explain how to use these fonts to create a custom theme.