Highlight types such as <type> in Python code blocks

[jared-hughes]

Simply runs a regex replacement after highlight.js does the rest of the highlighting. As a consequence, it does not highlight strings such as <class> which contain a Python keyword. This is relatively infrequent though.

[gto76]

Interesting, but adding another color is a bit much for my taste.

[jared-hughes]

Same for my taste. This simple bolding looks much better.

Also importantly, it preserves color within strings, which the green highlighting did not