amend incorred deployment instructions

Author: dario-piotrowicz

src/content/docs/workers/framework-guides/web-apps/tanstack.mdx

@@ -116,10 +116,25 @@ After you have created your project, run the following command in the project di
 
 Your project can be deployed to a `*.workers.dev` subdomain or a [Custom Domain](/workers/configuration/routing/custom-domains/), from your own machine or from any CI/CD system, including [Cloudflare's own](/workers/ci-cd/builds/).
 
-The following command will build and deploy your project. If you're using CI, ensure you update your ["deploy command"](/workers/ci-cd/builds/configuration/#build-settings) configuration appropriately.
+To deploy your application you will first need to build it:
+
+<PackageManagers type="run" args="build" />
+
+Once it's been built you can deploy it via:
 
 <PackageManagers type="run" args="deploy" />
 
+If you're using CI, ensure you update your ["deploy command"](/workers/ci-cd/builds/configuration/#build-settings) configuration appropriately.
+
+:::note
+
+After having built the application you can run the `serve` script to preview the built output locally before deploying it.
+This can help you making sure that your application will work as intended once it's been deployed to the Cloudflare network:
+
+<PackageManagers type="run" args="serve" />
+
+:::
+
 ---
 
 ## Bindings