feat: upadted 404 page

src/404.njk

@@ -0,0 +1,25 @@
+---
+layout: layouts/base.njk
+permalink: /404.html
+title: Page not found | River Rooks
+excerpt: The requested page could not be found.
+---
+<section class="not-found tile" aria-labelledby="not-found-title">
+  <header class="tile-header">
+    <span class="tile-title">// ROUTE STATUS</span>
+    <span class="tile-meta">HTTP 404 &bull; NOT FOUND</span>
+  </header>
+
+  <div class="not-found-body">
+    <h1 class="not-found-code" id="not-found-title">404<span class="not-found-cursor" aria-hidden="true">_</span></h1>
+    <div class="not-found-message">
+      <p class="not-found-label">REQUEST FAILED / NO MATCHING ROUTE</p>
+      <h2>Page not found.</h2>
+      <p>The address you requested doesn't point to a page here. Check the URL, or choose a known route below.</p>
+      <nav class="not-found-links" aria-label="Recovery links">
+        <a href="/">&gt; Back to home</a>
+        <a href="/dispatches/">&gt; Browse dispatches</a>
+      </nav>
+    </div>
+  </div>
+</section>