docs: Update titles to getting started topics (#38887)

The topics for our getting started tutorial are inconsistent.
This change makes the titles consistent and easier to read.

PR Close #38887

aio/content/navigation.json

@@ -61,27 +61,27 @@
             "children": [
               {
                 "url": "start",
-                "title": "A Sample App",
+                "title": "Getting started",
                 "tooltip": "Take a look at Angular's component model, template syntax, and component communication."
               },
               {
                 "url": "start/start-routing",
-                "title": "In-app Navigation",
+                "title": "Adding navigation",
                 "tooltip": "Navigate among different page views using the browser's URL."
               },
               {
                 "url": "start/start-data",
-                "title": "Manage Data",
+                "title": "Managing Data",
                 "tooltip": "Use services and access external data via HTTP."
               },
               {
                 "url": "start/start-forms",
-                "title": "Forms for User Input",
+                "title": "Using Forms for User Input",
                 "tooltip": "Learn about fetching and managing data from users with forms."
               },
               {
                 "url": "start/start-deployment",
-                "title": "Deployment",
+                "title": "Deploying an application",
                 "tooltip": "Move to local development, or deploy your application to Firebase or your own server."
               }
             ]

aio/content/start/index.md

@@ -1,4 +1,4 @@
-# Part 1: Getting started with a basic Angular app
+# Getting started with a basic Angular app
 
 Welcome to Angular!
 

aio/content/start/start-data.md

@@ -1,4 +1,4 @@
-# Try it: Manage data
+# Managing data
 
 At the end of [In-app Navigation](start/start-routing "Try it: In-app Navigation"), the online store application has a product catalog with two views: a product list and product details.
 Users can click on a product name from the list to see details in a new view, with a distinct URL, or route.

aio/content/start/start-deployment.md

@@ -1,4 +1,4 @@
-# Try it: Deployment
+# Deploying an application
 
 
 To deploy your application, you have to compile it, and then host the JavaScript, CSS, and HTML on a web server. Built Angular applications are very portable and can live in any environment or served by any technology, such as Node, Java, .NET, PHP, and many others.

aio/content/start/start-forms.md

@@ -1,4 +1,4 @@
-# Try it: Use forms for user input
+# Using forms for user input
 
 At the end of [Managing Data](start/start-data "Try it: Managing Data"), the online store application has a product catalog and a shopping cart.
 

aio/content/start/start-routing.md

@@ -1,4 +1,4 @@
-# In-app navigation
+# Adding navigation
 
 At the end of [part 1](start "Get started with a basic Angular app"), the online store application has a basic product catalog.
 The app doesn't have any variable states or navigation.