chore: block robot indexation

Co-authored-by: Miranda Limonczenko <miranda.limonczenko@supabase.io>

apps/kb/src/pages/index.astro

@@ -15,6 +15,7 @@ const sections = [
 
 <html lang="en" class="dark">
   <head>
+    <meta name="robots" content="noindex, nofollow" />
     <meta charset="utf-8" />
     <meta name="viewport" content="width=device-width, initial-scale=1" />
     <title>Supabase Knowledge Base</title>