Remove redundant dependencies (#613)

package.json

@@ -54,14 +54,10 @@
     "@storybook/addon-links": "^3.4.10",
     "@storybook/addons": "^3.4.10",
     "@storybook/react": "^3.4.10",
-    "babel-core": "^6.26.3",
     "babel-eslint": "^9.0.0",
     "babel-jest": "^23.4.2",
-    "babel-loader": "^7.1.4",
     "babel-plugin-transform-react-jsx": "^6.24.1",
-    "babel-preset-env": "^1.7.0",
     "babel-preset-preact": "^1.1.0",
-    "css-loader": "^1.0.0",
     "eslint": "^5.5.0",
     "eslint-config-airbnb": "^17.1.0",
     "eslint-config-airbnb-base": "^13.1.0",
@@ -76,13 +72,10 @@
     "jest": "^23.5.0",
     "jest-fetch-mock": "^1.6.5",
     "lint-staged": "^7.2.2",
-    "node-sass": "^4.9.3",
     "preact-compat": "^3.18.4",
     "preact-render-spy": "^1.3.0",
     "preact-render-to-json": "^3.6.6",
     "prettier": "^1.14.2",
-    "sass-loader": "^7.1.0",
-    "style-loader": "^0.23.0",
     "webpack-dev-server": "^2.11.3"
   },
   "dependencies": {