chore: add build-storybook script

package.json

@@ -34,6 +34,7 @@
     "clean": "gulp clean",
     "build": "gulp",
     "start": "sb dev",
+    "build-storybook": "sb build -c .storybook -o storybook-static",
     "prepublishOnly": "npm run build"
   },
   "dependencies": {