Revert "Switched syntax highlighting to HighlightJS"

This reverts commit aff24dabe8aa8193162c807c3ca9fa952fecc16d.
Revert "Revert "Switched syntax highlighting to HighlightJS""

This reverts commit fa9df5fffc7bbb14dde49b01049b1780792c0a3d.
Revert "Fixed broken disqus universal code"

This reverts commit 46cf5ae169684213bf59ec3a68fb478da34fe2bf.