docs/_includes/mathjax.html

<script>
MathJax = {
  tex: {
    inlineMath: [ ['$', '$'], ['\\(', '\\)'] ]
  },
  svg: {
    fontCache: 'global'
  }
};
</script>
<script
  type="text/javascript" id="MathJax-script" async
  src="https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-chtml.js">
</script>