How to add mathjax support to jekyll

I came across this excellent tutorial when I tried to add mathjax support to my jekyll site.

Here’s a brief summary:

In the _config.yml, add the following lines:

  # Build settings
  markdown: kramdown

On the top of the posts that you’d like to add mathjax support (it’s called the YAML ‘‘front matter’’) , add the following line:
```
  usemathjax: true
```

Add these lines to _includes/head.html:

    
    <!-- for mathjax support -->
    {% if page.usemathjax %}
      <script type="text/x-mathjax-config">
        MathJax.Hub.Config({
        TeX: { equationNumbers: { autoNumber: "AMS" } }
        });
      </script>
      <script type="text/javascript" async src="http://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML"></script>
    {% endif %}
    

After that, simply wrap the math symbols with two double-dollar sign $$:
```
$$E=mc^2$$
```
You should be able to see it in your post as: $E=mc^2$

Reference:

[1]: https://alan97.github.io/random/mathjax/