redirect warning

src/routes/blog/index.svelte

@@ -1,6 +1,9 @@
 <script context="module">
-  export async function preload() {
-    return this.fetch('/api/posts.json').then((res) => res.json())
+  export async function preload(page) {
+    return {
+      ...(await this.fetch('/api/posts.json').then((res) => res.json())),
+      redirected: page.query.old !== undefined,
+    }
   }
 </script>
 
@@ -9,13 +12,31 @@
   import PostPreview from '../../components/PostPreview.svelte'
 
   export let data
+  export let redirected
 </script>
 
+<style>
+  div {
+    margin-bottom: 6em;
+    background-color: var(--clr-error);
+    padding: 1em;
+  }
+</style>
+
 <svelte:head>
   <title>Blog</title>
 </svelte:head>
-
 <SimplePage title="Blog">
+  {#if redirected}
+    <div>
+      <h2>You have been redirected 🔄</h2>
+      <p>
+        Probably you are coming form my old blog (blog.nicco.io)
+        <br />
+        The article you were looking for is down here 👇
+      </p>
+    </div>
+  {/if}
   {#each data as post}
     <PostPreview {post} />
   {/each}