Docs: Manage image transformations (#44928)

## What kind of change does this PR introduce?

Docs update


<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **Documentation**
* Added a "Manage image transformations" guide in Storage docs
describing where to find the setting and how to use the Enable Image
Transformations toggle in Storage > Settings. Clarifies that disabling
the toggle stops all image transformation requests from being processed
and includes step‑by‑step user guidance.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

apps/docs/content/guides/storage/serving/image-transformations.mdx

@@ -15,6 +15,16 @@ Image Resizing is currently enabled for [Pro Plan and above](/pricing).
 
 </Admonition>
 
+## Manage image transformations
+
+You can enable or disable Image Transformations for your project from the [**Storage** > **Settings**](/dashboard/project/_/storage/files/settings) section of the Dashboard and toggle the **Enable Image Transformations** option.
+
+<Admonition type="note">
+
+Disabling Image Transformations prevents any image transformation requests from being processed. This can be useful to prevent unexpected usage or cost if you do not use this feature.
+
+</Admonition>
+
 ## Get a public URL for a transformed image
 
 Our client libraries methods like `getPublicUrl` and `createSignedUrl` support the `transform` option. This returns the URL that serves the transformed image.