Add MathJax to properly format code

[benoit74]

Fix #57

• make codecov status only informational, since we do not expect high coverage on scrapers for now

Nota: MathJax configuration is inspired from configuration found at https://github.com/freeCodeCamp/freeCodeCamp/blob/main/client/src/utils/math-jax.ts but updated for MathJax 3. Not 100% confident it will work flawlessly on all cases, but seems fine so far.

Before	After

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 9 lines in your changes missing coverage. Please review.

Project coverage is 43.02%. Comparing base (6286157) to head (3d56cc9).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
scraper/src/fcc2zim/build.py	0.00%	9 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #74      +/-   ##
==========================================
- Coverage   44.20%   43.02%   -1.19%     
==========================================
  Files           9        9              
  Lines         328      337       +9     
  Branches       41       43       +2     
==========================================
  Hits          145      145              
- Misses        182      191       +9     
  Partials        1        1              

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[rgaudin]

👍