Restore the promo top banner on docs and preview (main) (#3137)

docs/layouts/DocsLayout.astro

@@ -86,6 +86,8 @@ const pagePlugins = [...basePlugins, ...cssPlugins.filter((plugin) => !basePlugi
 const environment = process.env.NODE_ENV || 'production';
 // Vercel preview/branch deployments must not be indexed (VERCEL_ENV is unset locally).
 const isVercelPreview = !!process.env.VERCEL_ENV && process.env.VERCEL_ENV !== 'production';
+// The promo top banner loads on Vercel deploys (production and branch previews), never in local builds.
+const isVercelDeploy = !!process.env.VERCEL_ENV;
 
 // Strip /docs prefix (and optional .html) for the docs namespace URL.
 // Canonical form has no trailing slash (matching vercel.json trailingSlash: false);
@@ -549,5 +551,7 @@ const relatedPages = await Promise.all(
 		<!-- END GLOBAL MANDATORY SCRIPTS -->
 
 		<PageScripts />
+
+		{isVercelDeploy && <script is:inline src="https://scripts.tabler.io/banner.js" defer data-tblr-ref="tabler-docs" />}
 	</body>
 </html>