fix(#173): add config option to prevent clobbering user's numbered fo…

[daylinmorgan]

…otnotes

Exposes a new config option to define the footnote format:

... 
plugins:
  - search
  - bibtex:
      bib_file: "refs.bib"
      footnote_format: "ref{number}" # default "{number}"
...

[codecov]

Codecov Report

Patch coverage: 83.33% and project coverage change: -0.52 ⚠️

Comparison is base (b87ab9b) 98.24% compared to head (b8ef581) 97.72%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #192      +/-   ##
==========================================
- Coverage   98.24%   97.72%   -0.52%     
==========================================
  Files           3        3              
  Lines         171      176       +5     
==========================================
+ Hits          168      172       +4     
- Misses          3        4       +1     

Impacted Files	Coverage Δ
src/mkdocs_bibtex/plugin.py	95.94% <83.33%> (-1.16%)	⬇️

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[shyamd]

Thanks for taking a stab at this. The code looks clean and correct.

Can you add in a test case for:

• __init__ throwing an error on a invalid format and not on valid one
• format_footnote
• add another case to format_citations to check that the formatting is working correctly on the final product

[daylinmorgan]

I've been super busy thanks for rounding this out!