Changed bootstrap-sass back to bootstrap (with less). Theme now loads before the preloader is shown.

package.json

@@ -34,6 +34,7 @@
     "babel-loader": "^6.4.0",
     "babel-polyfill": "^6.23.0",
     "babel-preset-env": "^1.2.2",
+    "bootstrap": "^3.3.7",
     "css-loader": "^0.27.3",
     "exports-loader": "^0.6.4",
     "extract-text-webpack-plugin": "^2.1.0",
@@ -51,9 +52,8 @@
     "html-webpack-plugin": "^2.28.0",
     "imports-loader": "^0.7.1",
     "ink-docstrap": "^1.1.4",
-    "node-sass": "^4.5.2",
-    "sass-loader": "^6.0.3",
     "jsdoc-babel": "^0.3.0",
+    "less-loader": "^4.0.3",
     "style-loader": "^0.15.0",
     "url-loader": "^0.5.8",
     "web-resource-inliner": "^4.1.0",