Updated the header.

Added more header data.
Updated header

Added more detailed header info.
new header

- new header
fixed chapter number/display none (this is handled by the - PDF options.
deleted "chapter-number: display-none"

handled by PDF options.
changed the font for chapter title Hx's
added good import link for pressbooks-book/style.css
added times new roman as fallback font on Hxs
changed font for entry title / chapter title
font tweak.
added fallback font
delete/add
not sure this is new
font tweaks
font tweaks
a new space!