move napa from "devDependencies" to "dependencies"

Change-Id: I4dde9458868cd5c1c41b921414dff4b3dc9371de
Reviewed-on: https://gerrit.instructure.com/29878
Reviewed-by: Simon Williams <simon@instructure.com>
Reviewed-by: Jason Madsen <jmadsen@instructure.com>
Product-Review: Aaron Shafovaloff <ashafovaloff@instructure.com>
QA-Review: Aaron Shafovaloff <ashafovaloff@instructure.com>
Tested-by: Aaron Shafovaloff <ashafovaloff@instructure.com>