Add more colors to python.

TODO.org

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+* Things to do [3/14]
+** 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
+** TODO Bug: carry over highlight starts when breaking lines