better repl init + a bit of ssr for main repl

website/src/pages/index.astro

@@ -9,6 +9,6 @@ import { Repl } from '../repl/Repl';
     <title>Strudel REPL</title>
   </head>
   <body class="h-app-height bg-background">
-    <Repl client:only="react" />
+    <Repl client:load />
   </body>
 </html>