Update path, add changelog entry

Author: kristianfreeman

src/content/changelog/workers/2025-09-10-built-with-cloudflare-button.mdx

@@ -0,0 +1,13 @@
+---
+title: Built with Cloudflare button
+description: Our new "Built with Cloudflare" button can be used to share your stack of choice with the world.
+products:
+  - workers
+date: 2025-09-10
+---
+
+We've updated our "Built with Cloudflare" button to make it easier to share that you're building on Cloudflare with the world. Embed it in your project's README, blog post, or wherever you want to let people know.
+
+![Built with Cloudflare](https://workers.cloudflare.com/built-with-cloudflare.svg)
+
+Check out the [documentation](/workers/platform/built-with-cloudflare) for usage information.