Maven site simplification: remove CSS customization in all sub-modules (note: this is unrelated to Javadoc CSS).
Keep CSS customization only in the root (because easy to define and less intrusive than CSS in sub-modules).
Rely on Maven default for all sub-modules. This allows us to remove '<module>/src/site/resources/css/site.css'
symbolik links from all modules. Most of the time this change allows us to remove the whole 'site' directory.
We make this change because Maven site is not our main web site, so we make it simpler for easier maintenance
and less distraction when browsing source code directories.


git-svn-id: https://svn.apache.org/repos/asf/sis/branches/JDK7@1572676 13f79535-47bb-0310-9956-ffa450edef68