build(demo-app): use builder browser and built-in hmr

This PR fixes(conceals) SSR-related errors on HMR/route loading in the Demo App so that component development is not hampered.
The resolution of SSR errors should be handled in a separate PR.

Author: simeonoff

angular.json

@@ -15,15 +15,11 @@
       },
       "architect": {
         "build": {
-          "builder": "@angular-devkit/build-angular:application",
+          "builder": "@angular-devkit/build-angular:browser",
           "options": {
             "outputPath": "dist/igniteui-dev-demos",
+            "main": "./src/main.ts",
             "index": "src/index.html",
-            "browser": "src/main.ts",
-            "server": "src/main.server.ts",
-            "ssr": {
-              "entry": "src/server.ts"
-            },
             "polyfills": [
                 "zone.js",
                 "hammerjs"
@@ -39,6 +35,7 @@
             ],
             "scripts": [],
             "extractLicenses": false,
+            "buildOptimizer": false,
             "sourceMap": true,
             "optimization": false,
             "namedChunks": true,

package.json

@@ -3,7 +3,7 @@
   "version": "0.0.0",
   "scripts": {
     "ng": "ng",
-    "start": "ng serve --open --configuration hmr",
+    "start": "ng serve --open --hmr",
     "build": "ng build --configuration production",
     "test": "ng test igniteui-angular",
     "lint": "ng lint",