chore: add build script for storybook again (#708)

Author: MarcusNotheis

package.json

@@ -9,6 +9,7 @@
     "build": "npm-run-all -s clean build:bundle build:types",
     "build:bundle": "lerna run build --stream",
     "build:types": "lerna run build:types --stream",
+    "build:storybook": "lerna run build:i18n && build-storybook -c .storybook -o .out",
     "pretest": "rimraf coverage && lerna run build:i18n",
     "test": "jest --config=config/jest.config.js --coverage",
     "clean": "lerna run clean --stream && rimraf coverage",