Add storybook:deploy

Author: fakenickels

package.json

@@ -7,7 +7,7 @@
     "build": "babel lib --ignore __tests__ --out-dir ./dist",
     "prepublish": "npm run build",
     "storybook": "start-storybook -p 6006",
-    "build-storybook": "build-storybook"
+    "storybook:deploy": "storybook-to-ghpages"
   },
   "repository": {
     "type": "git",