Don't wrap code blocks

This is not as easy as you think. I tried white-space: nowrap and what that does is put the entire code block on one line.

from the highlight.js documentation, i think you need to enable this: hljs.configure({useBR: true});

but couldn't find how to initiate the server version with that and when i tried to manually edit the highlight.js node module to force that to true it didn't seem to work.

also need to think about backwards compatibility with old highlighted code.