Change default math engine to katex

[wenh06]

Change default math engine to katex following Issue #2

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.85%. Comparing base (1938195) to head (3b3f55a).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master       #4   +/-   ##
=======================================
  Coverage   96.85%   96.85%           
=======================================
  Files           3        3           
  Lines         127      127           
=======================================
  Hits          123      123           
  Misses          4        4           

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[Copilot]

Pull request overview

This PR changes the default math rendering engine from "mathjax3" to "katex" in response to Issue #2.

• Updates the default value of pseudocode2_math_engine configuration from "mathjax3" to "katex"

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