implement session/preload on server

templates/App.html

@@ -1,13 +1,12 @@
 <script>
 	import { setContext } from 'svelte';
-	import { writable } from 'svelte/store';
 	import { CONTEXT_KEY } from './internal';
 
 	export let Root;
 	export let props;
 	export let session;
 
-	setContext(CONTEXT_KEY, writable(session));
+	setContext(CONTEXT_KEY, session);
 </script>
 
 <Root {...props}/>