remove mini-css-extra-plugin dev dep

Author: possumbilities

webpack/package-lock.json

@@ -13,7 +13,6 @@
     "babel-loader": "^8.2.2",
     "bulma": "^0.9.2",
     "file-loader": "^6.2.0",
-    "mini-css-extract-plugin": "^1.3.9",
     "sass": "^1.54.4",
     "sass-loader": "^12.1.0",
     "style-loader": "^2.0.0",