[jackhogan]

Adds support for:

• bibliographies: a definition list inside ::: {.bibliography}, where each term is a citation label, and its id is the citation key.
• citations: using [@key] syntax with optional prefix/suffix text; supports numeric [1] and author-year (Howard and Ruder, 2018) rendering across all export formats.

E.g.:

Fine-tuning a pretrained language model [@howard2018] builds on AWD-LSTM [see @merity2017, p. 2]. [@howard2018]{ref=text} report results on six datasets.

::: {.bibliography}
Howard and Ruder, 2018 {#howard2018}
: Jeremy Howard and Sebastian Ruder. 2018. Universal Language Model Fine-tuning for Text Classification. In *Proceedings of ACL 2018*.
:::

The following table shows the various citation forms, and how each renders in the two styles:

md	author-year	numeric
[@howard2018]	(Howard and Ruder, 2018)	[12]
[@merity2017; @howard2018]	(Merity et al., 2017; Howard and Ruder, 2018)	[7, 12]
[see @howard2018, p. 3]	(see Howard and Ruder, 2018, p. 3)	see [12, p. 3]
[-@howard2018]	(2018)	[12]
[@howard2018]{ref=text}	Howard and Ruder (2018)	Howard and Ruder [12]
[@howard2018, p. 3]{ref=text}	Howard and Ruder (2018, p. 3)	Howard and Ruder [12, p. 3]
[-@howard2018]{ref=text}	2018	[12]
Merity et al. [-@merity2017a; -@merity2017b]	Merity et al. (2017a; 2017b)	Merity et al. [7, 8]

Author-year is the default; using cite_style: numeric in frontmatter, or cite_style='numeric' on bake, mdhtml2html, mdhtml2gfm, mdhtml2typst, md2html and viewmd selects numeric style, which numbers entries in bibliography order.

[jph00]

Thanks @jackhogan - implemented a slightly different design. Take a look - hope it's ok! :)