Swap order of using and configuring sections

It is not necessary to do any configuration of sass-enhance out of the
box. With the goal of helping people get the information they need to
get started as quickly as possible, I decided to swap the order of these
two sections.

Change-Id: I593f2db1c33a14316b348873cc13466b5b73c125
Reviewed-on: https://gerrit.causes.com/31491
Reviewed-by: Joe Lencioni <joe.lencioni@causes.com>
Tested-by: Joe Lencioni <joe.lencioni@causes.com>