Minify inline CSS, move syntax colors to bottom of page

Minify inline CSS, move syntax colors to bottom of page

This improves both maintainability and performance because the CSS
can be written out-of-line, and then get inserted and minified.

The stylesheet tag for the syntax colors got moved to the bottom of
the page, because CSS in the head tag blocks rendering until it's
loaded. Inside the body is dependent on browsers, but they all support
it and in the worst case you just get the original blocking behavior.