Add rpm module to highlightjs?

@falco — I had some time to look at this. Using Firefox’s built-in inspector, I can see that it properly add spans with classes hljs-type, hljs-keyword, etc. But if I look over on the styles side, I see a .hljs but not .hljs-type — only .hljs-keyword and .hljs-comment (the ones that work) seem to be there.