Update demo project to Angular 11

Author: shanmukhateja

demo/angular.json

@@ -54,7 +54,6 @@
               "optimization": true,
               "outputHashing": "all",
               "sourceMap": false,
-              "extractCss": true,
               "namedChunks": false,
               "extractLicenses": true,
               "vendorChunk": false,