All old, outdated, manually-generated translations of docs now
go into an "outdated" subdirectory. The "tuxpaint-docs"/gettext-based
ones are the "first-class citizens".
Don't install the docs directory's "Makefile", or the instructions
for how to release Tux Paint, as those are not necessary to end users.
Using the SVG-based "Tux Paint" title text at the top of HTML docs
(replacing ancient, totally-mouse-drawn one from 2002).
Also, while I was in there, added big "out of date" notices,
with links to English documentation, in outdated translated ones.
