Typst now supports CSL for its native citation engine, so pandoc
should use a specified `csl` style in the template, falling back to
`bibliographystyle` if `csl` is not specified.
https://typst.app/docs/reference/meta/bibliography/
With this change, the typst writer will omit the `#bibliography`
command when `citations` is not enabled. (If you want to use
pandoc's own `--citeproc`, you should combine it with
`-t typst-citations` to disable native typst citations.
Closes#8763.
+ Update manual with variables for Typst.
+ Split `lang` metadata into separate `lang` and `region` for Typst.
+ Fix label positioning in Divs.
+ Fix text customizations (lang, region, font, size) so they actually
work.
+ Update tests and man page.
John MacFarlane