docs: add Sirv loader for next/image (#57102)

Co-authored-by: Lee Robinson <me@leerob.io>

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

@@ -48,6 +48,7 @@ Alternatively, you can use the [`loader` prop](/docs/pages/api-reference/compone
 - [Imgix](#imgix)
 - [Thumbor](#thumbor)
 - [Sanity](#sanity)
+- [Sirv](#sirv)
 - [Supabase](#supabase)
 
 ### Akamai
@@ -172,6 +173,20 @@ export default function sanityLoader({ src, width, quality }) {
 }
 ```
 
+### Sirv
+
+```js
+// Docs: https://sirv.com/help/articles/dynamic-imaging/
+export default function sirvLoader({ src, width, quality }) {
+  const url = new URL(`https://example.com${src}`);
+  const params = url.searchParams;
+  params.set("format", params.getAll("format").join(",") || "optimal");
+  params.set("w", params.get("w") || width.toString());
+  params.set("q", (quality || 85).toString());
+  return url.href;
+}
+```
+
 ### Supabase
 
 ```js