Prototype for documentation improvements -- look and feel; suggested information architecture,
and some topic reorganization and revision.  Includes the following:

* Added _theme and _static resources to give help look and feel of ObjectRocket web site.
* Updated the Index page to simplify structure (only H1 and H2 levels) and re-organized. Added intro paragraph.
* Added Additional resources page as an example of other types of info that could be added to documentation for convenience.
* Consolidated Native drivers content and Data Access and Connectivity in one topic - Access your data.