add demo links

Author: nemanjam

src/content/post/2026/02-22-vercel-deploy-fastapi-nextjs/index.mdx

@@ -677,9 +677,11 @@ After clicking the "Vercel Deploy" button, the user will be taken to a form wiza
 
 <Image {...IMAGE_SIZES.FIXED.MDX_MD} src={VercelButtonWizardScreenshotImage} alt="Vercel button wizard" />
 
-## Completed code
+## Completed code and demo
 
 - **Repository and branch:** https://github.com/nemanjam/full-stack-fastapi-template-nextjs/tree/vercel-deploy
+- **Demo frontend deployed on Vercel:** https://full-stack-fastapi-template-nextjs.vercel.app
+- **Demo backend deployed on Vercel:** https://api-full-stack-fastapi-template-nextjs.vercel.app/docs
 
 The relevant branch `vercel-deploy` and files: