Ditch node-sass for dart sass

package.json

@@ -83,7 +83,6 @@
     "mini-css-extract-plugin": "0.4.5",
     "module-to-cdn": "3.1.2",
     "morgan": "1.9.1",
-    "node-sass": "4.13.0",
     "npm-run-all": "4.1.5",
     "plop": "2.3.0",
     "postcss-loader": "2.1.6",
@@ -91,6 +90,7 @@
     "react-addons-test-utils": "15.6.2",
     "react-dom": "16.8.6",
     "react-hot-loader": "4.8.8",
+    "sass": "^1.25.0",
     "sass-loader": "7.1.0",
     "serve": "11.2.0",
     "style-loader": "0.21.0",