chore(docs): add example of sanity image to loaderFile config (#54529)

https://www.sanity.io/docs/image-urls

docs/02-app/02-api-reference/05-next-config-js/images.mdx

@@ -47,6 +47,7 @@ Alternatively, you can use the [`loader` prop](/docs/pages/api-reference/compone
 - [ImageEngine](#imageengine)
 - [Imgix](#imgix)
 - [Thumbor](#thumbor)
+- [Sanity](#sanity)
 - [Supabase](#supabase)
 
 ### Akamai
@@ -153,6 +154,24 @@ export default function thumborLoader({ src, width, quality }) {
 }
 ```
 
+### Sanity
+
+```js
+// Docs: https://www.sanity.io/docs/image-urls
+export default function sanityLoader({ src, width, quality }) {
+  const prj = 'zp7mbokg'
+  const dataset = 'production'
+  const url = new URL(`https://cdn.sanity.io/images/${prj}/${dataset}${src}`)
+  url.searchParams.set('auto', 'format')
+  url.searchParams.set('fit', 'max')
+  url.searchParams.set('w', width.toString())
+  if (quality) {
+    url.searchParams.set('q', quality.toString())
+  }
+  return url.href
+}
+```
+
 ### Supabase
 
 ```js