Updated page layout to Spree 1.3

Signed-off-by: Nathan Lowrie <nate@finelineautomation.com>
Updated contents to Spree 1.3

Signed-off-by: Nathan Lowrie <nate@finelineautomation.com>
Updated page contents and images to Spree 1.3

Signed-off-by: Nathan Lowrie <nate@finelineautomation.com>