streamline web documentation

This is the next step in reducing the amount of typing
in bookmaker, and presenting a web-base interface that
more closely matches the include documentation.

Moving towards making xxx_Reference solely contain
use documentation, and xxx_Overview (unpublished)
contain theory of operation documentation.

Fixed quite a few bugs along the way, and made
function and member documentation tighter.

TBR=caryclark@google.com
Docs-Preview: https://skia.org/?cl=160640
Change-Id: I763df4d59baa5dfd0177f0523294b5316434c4b0
Reviewed-on: https://skia-review.googlesource.com/c/160640
Reviewed-by: Cary Clark <caryclark@skia.org>
Commit-Queue: Cary Clark <caryclark@skia.org>
Auto-Submit: Cary Clark <caryclark@skia.org>
40 files changed