Updating quick start guide (#2310)

## Motivation for the change, related issues

With the new playground design, the location of the menu options has
changed at [Quick Start
Guide](https://wordpress.github.io/wordpress-playground/quick-start-guide).
This pull request adds the latest screenshots and new instructions for
downloading the zip file with the current changes, importing it, and
switching WordPress and PHP versions.

Issue related: #2168

### Instructions to save local progress:
<img width="1226" alt="Screenshot 2025-06-30 at 18 38 52"
src="https://github.com/user-attachments/assets/edab39f9-5a2f-47a4-a9dd-8361c97c1438"
/>

### Importing saved progress:
<img width="1115" alt="Screenshot 2025-06-30 at 18 38 58"
src="https://github.com/user-attachments/assets/ebd8454b-1dd8-447b-9d60-668ca49bd50f"
/>

### Switching WordPress and PHP version
<img width="1098" alt="Screenshot 2025-06-30 at 18 39 04"
src="https://github.com/user-attachments/assets/af615309-db76-4424-9fa5-f5a783c8c830"
/>

Author: fellyph

packages/docs/site/docs/main/quick-start-guide.md

@@ -53,27 +53,31 @@ https://playground.wordpress.net/?plugin=coblocks&plugin=friends&theme=pendant
 
 ## Save your site
 
-To keep your WordPress Playground site for longer than a single browser session, you can export it as a zip file.
+To keep your WordPress Playground site for longer than a single browser session, you can export it as a `.zip` file.
 
-Use the "Export" button in the top bar:
+1. Open the Plaground site manager panel:
 
-![Export button](@site/static/img/export-button.png)
+![Site Manager](@site/static/img/open-site-manager.webp)
+
+2. Use the "Download as .zip" button in the additional actions menu
+
+![Export button](@site/static/img/site-manager-menu.webp)
 
 The exported file contains the complete site you've built. You could host it on any server that supports PHP and SQLite. All WordPress core files, plugins, themes, and everything else you've added to your site are in there.
 
 The SQLite database file is also included in the export, you'll find it `wp-content/database/.ht.sqlite`. Keep in mind that files starting with a dot are hidden by default on most operating systems so you might need to enable the "Show hidden files" option in your file manager.
 
 ## Restore a saved site
 
-You can restore the site you saved by using the import button in WordPress Playground:
+You can restore the saved site using the "Import from .zip" button in the site management panel:
 
-![Import button](@site/static/img/import-button.png)
+![Import from .zip button](@site/static/img/site-manager-import-actions-menu.webp)
 
 ## Use a specific WordPress or PHP version
 
-The easiest way is to use the version switcher on [the official demo site](https://playground.wordpress.net/):
+The quickest way to change the version of WordPress or PHP is by using the settings panel on the [official demo site](https://playground.wordpress.net/):
 
-![WordPress Version switcher](@site/static/img/wp-version-switcher.png)
+![WordPress Playground Settings menu](@site/static/img/playground-settings-menu.webp)
 
 :::info Test your plugin or theme