fix: upgrade to Angular v12

add README details

Author: twerske

README.md

@@ -1,15 +1,17 @@
-# A11y in Angular demo : A Dumpling Shop
+# Build more accessible Angular apps : Dumpling Shop demo
 
-Demo for the [Build more accessible Angular apps](codelabs.developers.google.com/angular-a11y) codelab.
+Demo for the [Build more accessible Angular apps](https://codelabs.developers.google.com/angular-a11y) codelab.
 
 
 ## Get set up
 
 Run `npm install` to install the dependencies required to run the server.
 
+Run `git checkout get-started` to use the `get-started` branch for the codelab. All solutions can be found in the `main` branch.
+
 Run `ng serve --hmr` to run the server.
 
-Open a browser tab to [http://localhost:4200](). The app will automatically reload if you change any of the source files.
+Open a browser tab to [http://localhost:4200](http://localhost:4200). The app will automatically reload if you change any of the source files.
 
 
 ## Disclaimer

angular.json

@@ -28,15 +28,22 @@
             "main": "src/main.ts",
             "polyfills": "src/polyfills.ts",
             "tsConfig": "tsconfig.app.json",
-            "aot": true,
             "assets": [
               "src/favicon.ico",
               "src/assets"
             ],
             "styles": [
               "src/styles.scss"
             ],
-            "scripts": []
+            "inlineStyleLanguage": "scss",
+            "scripts": [],
+            "vendorChunk": true,
+            "extractLicenses": false,
+            "buildOptimizer": false,
+            "sourceMap": true,
+            "optimization": false,
+            "namedChunks": true,
+            "aot": false
           },
           "configurations": {
             "production": {