Upgrade to Angular 15 and Node 18

Author: jhades

.browserslistrc

@@ -3,13 +3,13 @@
 
 This repository contains the code of the course [Angular Universal In Depth](https://angular-university.io/course/angular-universal-course).
 
-This course repository is updated to Angular v14.
+This course repository is updated to Angular v15.
 
 ![Angular Universal In Depth](https://angular-university.s3-us-west-1.amazonaws.com/course-images/angular-universal-course.jpg)
 
 # Installation pre-requisites
 
-Please use the latest Node long-term support (LTS) version.
+Please use  Node 18 long-term support (LTS) version.
 
 # Installing the Angular CLI
 
@@ -37,22 +37,21 @@ NPM 5 or above has the big advantage that if you use it you will be installing t
 
 This should take a couple of minutes. If there are issues, please post the complete error message in the Questions section of the course.
 
-# To Run the Development Backend Server
-
-In order to be able to provide realistic examples, we will need in our playground a small REST API backend server. We can start the sample application backend with the following command:
-
-    npm run server
-
-This is a small Node REST API server.
-
 # To run the Development UI Server
 
 To run the frontend part of our code, we will use the Angular CLI:
 
     npm start 
 
-The application is visible at port 4200: [http://localhost:4200](http://localhost:4200)
+The application is available at port 4200: [http://localhost:4200](http://localhost:4200)
+
+# To run the Angular Universal Live Development Server
+
+To run the application in development mode but still have it server side rendered:
+
+    npm run dev:ssr 
 
+The live universal application is available at port 4200: [http://localhost:4200](http://localhost:4200)
 
 
 # Important 

README.md

@@ -27,7 +27,6 @@
               "src/assets"
             ],
             "styles": [
-              "./node_modules/@angular/material/prebuilt-themes/purple-green.css",
               "src/styles.scss"
             ],
             "scripts": [],
@@ -170,4 +169,4 @@
   "cli": {
     "analytics": "fa1e8b50-e624-42fd-9564-a9c98d1ad337"
   }
-}
+}