docs[nextjs-push]: add second screenshot and update first

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: maratal

src/images/content/screenshots/getting-started/nextjs-push-getting-started-guide-2.png

@@ -421,6 +421,8 @@ ably channels publish exampleChannel1 '{"name":"example","data":"Hello from CLI!
 ```
 </Code>
 
+![Screenshot of the Next.js push tutorial application showing push notifications received](../../../../images/content/screenshots/getting-started/nextjs-push-getting-started-guide.png)
+
 If you unsubscribe from this channel in the app's UI, you will no longer receive push notifications for that channel. Send the same command again and verify that no notification is received.
 
 You can also send push notifications right from your app. The next step will show you how.
@@ -522,7 +524,7 @@ Add the three send buttons to the JSX inside the buttons `div`:
 
 Now you can send push notifications to your device, client, or channel using the buttons in the UI:
 
-![Screenshot of the Next.js push tutorial application showing push notifications received](../../../../images/content/screenshots/getting-started/nextjs-push-getting-started-guide.png)
+![Screenshot of the Next.js push tutorial application showing push notifications received](../../../../images/content/screenshots/getting-started/nextjs-push-getting-started-guide-2.png)
 
 ## Browser compatibility <a id="browser-compatibility"/>