update tests, move test app to v2

test/app/routes/blog/[slug].html

@@ -1,11 +1,11 @@
-<:Head>
-	<title>{{post.title}}</title>
-</:Head>
+<svelte:head>
+	<title>{post.title}</title>
+</svelte:head>
 
-<h1>{{post.title}}</h1>
+<h1>{post.title}</h1>
 
 <div class='content'>
-	{{{post.html}}}
+	{@html post.html}
 </div>
 
 <script>