Adding support for more languages

[dwrolvink]

First off, love this plugin. For me though, it would be pretty useful to have powershell support.

The highlight plugin doesn't have it either. Very much a bummer, because most markdown engines support it, including GitHub.

Prism.js supports it, and getting the code from their site, I managed to get some powershell highlighting going, but then the integration with your plugin is broken, because I'm basically using "vanilla" prism.js. (Or perhaps the integration breaks in a different way, I'm not sure).

I can't deal with minified js files. Is it possible that you share the non-minified js? (If you did in fact modify it).

Alternatively, just having a version that supports all languages that Prism.js supports would be nice. (Or just powershell ;) )

If adding extra languages is somehow very complex/time consuming, then I beg your pardon, I have no idea what you have to do to get it working in/with Grav.

[clemdesign]

Because I would like to add others languages support, I took the opportunity to add your request. I proposed a new PR referenced before.