link prefetching

src/routes/[slug].svelte

@@ -1,10 +1,18 @@
 <script context="module">
     export async function load({ page }) {
-        let post = await import(`./_posts/${page.params.slug}.svx`);
-        return {
-            props: {
-                meta: post.metadata,
-                body: post.default
+        try {
+            let post = await import(`./_posts/${page.params.slug}.svx`);
+            return {
+                props: {
+                    meta: post.metadata,
+                    body: post.default
+                }
+            }
+        }
+        catch (err) {
+            return {
+                status: 404,
+                error: `Not found: ${page.path}`,
             }
         }
     }