Add storybook

Author: jakobkolb

frontend/package.json

@@ -16,7 +16,9 @@
     "heroku-postbuild": "yarn run build",
     "lint": "eslint --ext .ts --ext .tsx src/",
     "typecheck": "tsc -p tsconfig.json --noEmit",
-    "serve": "ts-node mock-api/server"
+    "serve": "ts-node mock-api/server",
+    "storybook": "start-storybook -p 9009 -s public",
+    "build-storybook": "build-storybook -s public"
   },
   "homepage": "/app/static",
   "dependencies": {
@@ -68,6 +70,11 @@
     "redux-thunk": "^2.3.0"
   },
   "devDependencies": {
+    "@storybook/addon-actions": "^5.3.19",
+    "@storybook/addon-links": "^5.3.19",
+    "@storybook/addons": "^5.3.19",
+    "@storybook/preset-create-react-app": "^3.1.4",
+    "@storybook/react": "^5.3.19",
     "@types/axios": "^0.14.0",
     "@types/body-parser": "^1.19.0",
     "@types/classnames": "^2.2.10",