Does it support other languages?

The template only has `html` and `css` tag! But can we add JavaScript `js`, `C/C++`, `C#`, etc...? Basically what I'm asking is that this project is like a PasteBin for Code or Gist but with preview? If so, what are the technologies do you plan to support for Previews (_Outputs_) and what are the ones that are just snippets?