Previously, the support library revision history had been on
index.html, along with the overview. Pulling the history out onto
its own page. (There doesn't seem to be a way to set up a redirect--
redirects from /foo.html#bar to /bar.html don't seem to be honored.)
bug: 28721552
Change-Id: I26b8aead4161f1555cead02a4c61cc1b45ca1dbe
Also added the libraries sub-TOC to the "API Guides" TOC.
See first comment for doc stage location.
Change-Id: I06aac939e40ffad7888801ea01f6d4decd6eb4d1
Per discussion with JF and DD, the new holding pen for not-quite-
top-level topics will be a "/topic/" directory, not "/go/". (Currently
the only thing living there is the new "libraries" section.)
Updating redirects and TOCs accordingly. See first comment for
doc stage location.
bug: 28558659
Change-Id: I09201a8334cac70d76559a106a74d5a29fe82128
