Use webpack for bundling JS libs and move Golang code related to Iframe generation there

javascript/package.json

@@ -35,10 +35,11 @@
     "@babel/preset-env": "^7.1.0",
     "babel-loader": "^8.0.4",
     "babel-polyfill": "^6.26.0",
-    "clean-webpack-plugin": "^0.1.19",
     "core-js": "^2.5.7",
+    "html-webpack-inline-source-plugin": "^0.0.10",
     "html-webpack-plugin": "^3.2.0",
     "webpack": "^4.23.1",
+    "webpack-clean": "^1.2.3",
     "webpack-cli": "^3.1.2"
   }
 }