📚 DOC: document available bib styles

[emdupre]

Closes #838.

Right now I'm only pointing to other available styles, rather than providing an example of each.
I realized it might be a bit overwhelming to show all four possible styles in one place, but I'm happy to add this in if folks think it would be useful !

[codecov]

Codecov Report

Merging #845 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #845   +/-   ##
=======================================
  Coverage   84.88%   84.88%           
=======================================
  Files           8        8           
  Lines         668      668           
=======================================
  Hits          567      567           
  Misses        101      101           

Flag	Coverage Δ
#pytests	84.88% <ø> (ø)

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[choldgraf]

this looks great! do you think you could add it as a subsection underneath the current one? So a ### header that comes just before the cross-referencing section?

[emdupre]

GitHub is really calling me out my workflow of commit, push, and immediately notice a typo 😅

I think that's the last of them, though ! Let me know what you think of the current format !

[choldgraf]

this looks great! thanks for the improvement :-)