Markdown guide refers to Highlightjs but Rouge is used

[GjjvdBurg]

Thanks for building Jupyter-Book! I stumbled on a very minor issue in the documentation that caused some confusion and that you might want to fix.

The Markdown cheatsheet at ./jupyter_book/book_template/content/features/limits.md refers users to the highlightjs list of language names, but as far as I can tell from _config.yml the syntax highlighting is actually done by rouge. The list of languages between the two is not the same and neither is the result. This caused some confusion because my Makefile syntax wasn't highlighted correctly and this turned out to be a bug in rouge.

Pinging @alexmorley because it explains this problem as well.

[choldgraf]

ah - I believe that information isn't actually correct, it should in-fact be using Rouge...@alexmorley just added that page to test how Jupyter-Book handles really long pages. I think we should change that information to make sure it's correct!