Plan for improved bibliography

[davidfarmer]

Step 1: Add more tags and be backward compatible with current type="bibtex" entries.

These new tags should be informed by Citation Style Language, and probably should use the
tags in CSL-Json https://citeproc-js.readthedocs.io/en/latest/csl-json/markup.html

Step 2: Add a new publisher option to choose among the 10,000 available styles.

Step 3: Decide how to handle the case where a current type="bibtex" entry is handed
to a CSL choice.

[rbeezer]

Initial experiments suggest that

https://github.com/citeproc-py/citeproc-py

can do most all of the hard work within our Python code. Ingests JSON or BibTeX, outputs very lightly marked-up HTML. CSL stylesheet is an input to the process, but requires no knowledge of how that works.