Version Control With Subversion Source

* src/en/book/styles.css
Newer versions of the XSL stylesheets are a) picking up the
admonishment images by name mathing now, and b) formatting
admonishments using a two-column table (with the graphic occupying
the left column, and the text the right. So we can lose some of
our HTML stylesheet stuff now. (I wish I knew a way of doing
this kind of stuff optionally based on versions of tools and
XSL stylesheets and such. But I don't.)