Render inline math on the Data Challenge page

[Copilot]

Inline LaTeX expressions such as $x$ and $\alpha$ were displayed as raw text on the Data Challenge Data page.

• MathJax: Add MathJax 3 with $...$ and \(...\) inline delimiters.
• Scope: Apply the configuration only to the affected page.

<script>
window.MathJax = {
  tex: { inlineMath: [["$", "$"], ["\\(", "\\)"]] }
};
</script>

[Copilot]

Pull request overview

Adds page-scoped MathJax configuration to ensure inline LaTeX (e.g., $x$, $\alpha$) renders correctly on the RMDC26 Data page without affecting other pages.

Changes:

• Injects a window.MathJax configuration enabling $...$ and \(...\) inline delimiters.
• Loads MathJax 3 (tex-chtml) from a CDN on the Data Challenge Data page only.

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