fix: math notations in tutorial pages

[wodeni]

Description

The "Writing Constraints & Objectives" page in the tutorial contains some TeX expressions that are not rendered. This PR adds KaTeX support to render them.

Implementation strategy and design decisions

Mostly followed the docs here: https://docusaurus.io/docs/markdown-features/math-equations

Examples with steps to reproduce them

Checklist

• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new ESLint warnings
• I have reviewed any generated changes to the diagrams/ folder

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[codecov]

Codecov Report

Merging #926 (8785b2b) into main (4b93202) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #926   +/-   ##
=======================================
  Coverage   68.15%   68.15%           
=======================================
  Files          62       62           
  Lines        8123     8123           
  Branches     1771     1771           
=======================================
  Hits         5536     5536           
  Misses       2580     2580           
  Partials        7        7           

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