Revert "Merge pull request #1 from asdfgh746/syntax-highlighting"

This reverts commit 3b212812a00bf35ec3190c0b0658b4b13f3a7c40, reversing
changes made to 5244aad8369ebe7cd30a39f08e53ce3d3cc12124.

Syntax highlighting was breaking the layout. Reverting to using GitHub
Gists until a solution can be found.