Documentation-updates (#5104)

* Updated the @latest command for NextJS

* streamlined the getting started guide

Author: Abdallah Shaban

src/fragments/lib/auth/js/getting-started.mdx

@@ -42,7 +42,7 @@ import reactnative0 from '/src/fragments/lib/auth/js/getting-started-steps-basic
 
 <Fragments fragments={{ 'react-native': reactnative0 }} />
 
-In your app's entry point (i.e. **App.js**, **index.js**, or **main.js**), import and load the configuration file:
+In your app's entry point (i.e. **App.js**, **index.js**, **_app.js**, or **main.js**), import and load the configuration file:
 
 ```javascript
 import { Amplify, Auth } from 'aws-amplify';

src/fragments/start/getting-started/next/setup.mdx

@@ -3,7 +3,7 @@ To set up the project, you'll first create a new Next.js app with [Create Next A
 From your projects directory, run the following commands:
 
 ```bash
-npx create-next-app next-amplified
+npx create-next-app@latest next-amplified
 cd next-amplified
 ```
 
@@ -84,6 +84,4 @@ The first step to using Amplify in the client is to install the necessary depend
 npm install aws-amplify @aws-amplify/ui-react
 ```
 
-The `aws-amplify` package is the main library for working with Amplify in your apps. The `@aws-amplify/ui-react` package includes React-specific UI components you'll use as you build the app.
-
-Now that your Next.js app is set up and Amplify is initialized, you're ready to add an API in the next step.
+The `aws-amplify` package is the main library for working with Amplify in your apps. The `@aws-amplify/ui-react` package includes React-specific UI components that you can use to build your app UI. To learn more about Amplify UI visit our [documentation](https://ui.docs.amplify.aws/).

src/fragments/start/getting-started/vanillajs/nextsteps.mdx

@@ -8,54 +8,3 @@
 - [Push Notification](/lib/push-notifications/getting-started)
 - [PubSub](/lib/pubsub/getting-started)
 - [AR/VR](/lib/xr/getting-started)
-
-## Existing AWS Resources
-
-If you want to use your existing AWS resources with your app you will need to **manually configure** your app with an `awsconfiguration.json` file in your code. For example, if you were using Amazon Cognito Identity, Cognito User Pools, AWS AppSync, or Amazon S3:
-
-```json
-{
-    "CredentialsProvider": {
-        "CognitoIdentity": {
-            "Default": {
-                "PoolId": "XX-XXXX-X:XXXXXXXX-XXXX-1234-abcd-1234567890ab",
-                "Region": "XX-XXXX-X"
-            }
-        }
-    },
-    "CognitoUserPool": {
-        "Default": {
-            "PoolId": "XX-XXXX-X_abcd1234",
-            "AppClientId": "XXXXXXXX",
-            "Region": "XX-XXXX-X"
-        }
-    },
-    "AppSync": {
-        "Default": {
-            "ApiUrl": "https://XXXXXX.appsync-api.XX-XXXX-X.amazonaws.com/graphql",
-            "Region": "XX-XXXX-X",
-            "AuthMode": "AMAZON_COGNITO_USER_POOLS"
-        }
-    },
-    "S3TransferUtility": {
-        "Default": {
-            "Bucket": "BUCKET_NAME",
-            "Region": "XX-XXXX-X"
-        }
-    }
-}
-```
-
-In the configuration above, you would need to set the appropriate values such as `Region`, `Bucket`, etc.
-
-## AWS SDK Interfaces
-
-For working with other AWS services you can use service interface objects directly via the generated SDK clients. 
-
-<Callout>
-
-To work with service interface objects, your Amazon Cognito users' [IAM role](https://docs.aws.amazon.com/cognito/latest/developerguide/iam-roles.html) must have the appropriate permissions to call the requested services.
-
-</Callout>
-
-You can call methods on any AWS Service interface object supported by the AWS Android SDK by passing your credentials from the AWSMobileClient to the service call constructor. See [SDK Setup Options](/sdk/configuration/setup-options) for more information.