Because apparently green doesn't show up super-bright with traditional
CMYK printing, so my business card with the green-on-black header
wouldn't have looked great - unless I was willing to pay a lot of money
for special printing.

However, apparently yellow does show up well (probably because it's the
Y in CMYK), and because old-old-school CRTs came in amber-on-black as
well as green-on-black, switching to amber-on-black lets me keep the
same kind of aesthetic while being more print-friendly.

Also, it looks less Matrix-y. On the one hand, that's better because it
looks less derivative. On the other, it's worse, because it doesn't grab
you quite as instinctively as it did before.

I've done it with alternate stylesheets though, so you can still pick
the green colorscheme if you want.

The code is now a bit longer, but it's also a bit clearer. The resulting
HTML is also clearer.

How very meta!

Rather than the generic "sans-serif"

Also add an /about page with licensing info for the icons, as well as
links to their sources, and other random trivia and nerdery.