* Things to do [4/14]
** DONE If the paragraph only contains an image, text-align center
** DONE Syntax highlighting for code blocks
** TODO Render gnuplot
** TODO Pretty-print the timestamps
** TODO Support Table of Contents
** TODO Support line numbers in code blocks
** TODO Support references to code block lines
** TODO Only include text up to first heading on homepage and include a "read more" link
** DONE Make loading language-specific CSS files conditional on the presence of src blocks using those languages
** TODO Set up tracing so I can use warning and such
** TODO Make copying of language-specific CSS files conditional on the presence of src blocks using those languages
** TODO Switch to an entirely lazily-evaluated output tree
** TODO Add highlighting for languages [0/2]
*** TODO bash
*** TODO gnuplot
** DONE Bug: carry over highlight starts when breaking lines