small-study example isn't self contained

[pdehaan]

A couple of the scripts in the examples/small-study/package.json reach up into the main project directory (which makes it difficult to copy/paste the small-study as a new project; since ../../ wouldn't resolve):

shield-studies-addon-utils/examples/small-study/package.json

Lines 6 to 11 in cffa11e

	"scripts": {
	"bundle-utils": "../../bin/copyStudyUtils.js src/privileged",
	"postinstall": "npm run rebuild",
	"rebuild": "(cd ../../ && npm run build) && npm run bundle-utils",
	"start": "web-ext run"
	},

Not sure if it'd be easier to move the small-study template into its own repo so we can add shield-study-addon-utils as a dependency. Or, if we move the small-study template into the https://github.com/mozilla/create-shield-study/tree/master/templates/shield-study directory.

[motin]

https://github.com/mozilla/create-shield-study is not ready for production, but we can definitely move the small-study to a separate repo. Related: mozilla/shield-studies-addon-template#91