fix official site migrations page title

Author: lovasoa

examples/official-site/your-first-sql-website/migrations.sql

@@ -1,7 +1,12 @@
 select 'http_header' as component,
-	'public, max-age=300, stale-while-revalidate=3600, stale-if-error=86400' as "Cache-Control";
+	'public, max-age=300, stale-while-revalidate=3600, stale-if-error=86400' as "Cache-Control",
+	'<https://sql-page.com/your-first-sql-website/migrations>; rel="canonical"' as "Link";
 
-select 'dynamic' as component, properties FROM example WHERE component = 'shell' LIMIT 1;
+select 'dynamic' as component, json_patch(json_extract(properties, '$[0]'), json_object(
+    'title', 'SQLPage migrations',
+    'description', 'Manage your database schema with SQLPage using migrations.'
+)) as properties
+FROM example WHERE component = 'shell' LIMIT 1;
 
 -- Article by Matthew Larkin
 select 'text' as component,