feat: add favicons, support embedded assets properly

- Refactor asset serving to check embedded assets before proxying

web/src/routes/+layout.svelte

@@ -35,7 +35,9 @@
 </script>
 
 <svelte:head>
-  <link rel="icon" href="/favicon.ico" />
+  <link rel="icon" href="/favicon.svg" type="image/svg+xml" />
+  <link rel="icon" href="/favicon-192.png" type="image/png" sizes="192x192" />
+  <link rel="apple-touch-icon" href="/apple-touch-icon.png" />
 
   <!-- Primary Meta Tags -->
   <title>{metadata.title}</title>