docs: Update doc to use `ng` firebase schematics for deployment (#35355)

Previously, the `deployment` section, was using the `firebase`
CLI to deploy the angular project into firebase. With the better
integration through the `fire` schematics, it is now easier to
deploy angular applications into firebase. This commit takes
care of this, by outlined the required steps for deployment.

Closes #35274

PR Close #35355

aio/content/start/deployment.md

@@ -66,13 +66,13 @@ One of the easiest ways to get your site live is to host it using Firebase.
 
 1. Sign up for a firebase account on [Firebase](https://firebase.google.com/ "Firebase web site").
 1. Create a new project, giving it any name you like.
-1. Install the `firebase-tools` CLI that will handle your deployment using `npm install -g firebase-tools`.
+1. Add the `@angular/fire` schematics that will handle your deployment using `ng add @angular/fire`.
 1. Connect your CLI to your Firebase account and initialize the connection to your project using `firebase login` and `firebase init`.
 1. Follow the prompts to select the `Firebase` project you are creating for hosting.
-  - Select the `Hosting` option on the first prompt.
-  - Select the project you previously created on Firebase.
-  - Select `dist/my-project-name` as the public directory.
-1. Deploy your application with `firebase deploy`, because the command `firebase init` has created a `firebase.json` file that tells Firebase how to serve your app.
+    - Select the `Hosting` option on the first prompt.
+    - Select the project you previously created on Firebase.
+    - Select `dist/my-project-name` as the public directory.
+1. Deploy your application with `ng deploy`.
 1. Once deployed, visit https://your-firebase-project-name.firebaseapp.com to see it live!
 
 ### Hosting an Angular app anywhere else