zmin/exampleSite/layouts/partials/foot_custom.html

<script src="//yihui.name/js/math-code.js"></script>
<script type="text/x-mathjax-config">
MathJax.Hub.Config({
  tex2jax: {
    inlineMath: [['$','$'], ['\\(','\\)']],
    processEscapes: true
  }
});
</script>
<script async src="//cdn.bootcss.com/mathjax/2.7.1/MathJax.js?config=TeX-MML-AM_CHTML"></script>

<script async src="//yihui.name/js/center-img.js"></script>