Lots of technical improvements

angular.json

@@ -29,6 +29,7 @@
             "inlineStyleLanguage": "scss",
             "assets": [
               "src/assets/favicon.ico",
+              "src/manifest.webmanifest",
               {
                 "glob": "**/*",
                 "input": "public"
@@ -59,7 +60,8 @@
                   "maximumError": "8kB"
                 }
               ],
-              "outputHashing": "all"
+              "outputHashing": "all",
+              "serviceWorker": "ngsw-config.json"
             },
             "development": {
               "optimization": false,