Introduction to Capstan

New page on Capstan for the Getting Started section of
the web site.

Also bump the date of "intro" to keep it at the top.

Signed-off-by: Don Marti <dmarti@cloudius-systems.com>
Merge pull request #32 from dmarti/capstan-intro

Introduction to Capstan
Add slide widget to home page and move up calls to action

Work in progress.  Needs rework of proportions of slide
widget.

Signed-off-by: Don Marti <dmarti@cloudius-systems.com>
Merge branch 'slide-widget' into gh-pages