Add syntax highlighting to examples

[ben-albrecht]

Chapel syntax highlighting should work in Jekyll using pygments, as described here.

We should be able to enable syntax highlighting with:

{% highlight chapel %}
// chapel code here
{% endhighlight %}

[jstaf]

That sounds great, let's add it in! (I'll admit I didn't realize Chapel syntax highlighting was supported yet)

[tkphd]

Invoking pygment directly should work, but it's not how syntax highlighting is handled in the rest of the Carpentries. The more consistent approach would be to modify syntax.css to define a chapel style, then append {: .language-chapel} to the Chapel code blocks.

[ben-albrecht]

Here is the list of highlighting tools supported by Chapel today:

https://github.com/chapel-lang/chapel/tree/master/highlight

Maybe one of the formats could be easily ported to the format HPC Carpentry uses.

[ben-albrecht]

Additionally, there are a few highlighting formats that are managed outside of the repository, which are listed in this issue about improving maintenance of syntax highlighting tools for Chapel:

https://github.com/chapel-lang/chapel/issues/5908