Explain a bit more about the nature of our open community, and make
connections between this and StoryBoard's unique feature set.
Move the REST API section to the bottom, since this is the least
user-facing aspect and more of an implementation detail.
Also tweak the wording from the style in the original blog post, to
reflect that this is now documentation of a project which is no longer
brand new.
Change-Id: I0a9cac50f3d6d5db13b3d820f0212632cc048454
24f0187925