Mark website content as outdated.

The Scala 3 documentation is now hosted at https://docs.scala-lang.org.

Author: julienrf

docs/_layouts/main.html

@@ -2,6 +2,11 @@
 layout: base
 ---
 <div id="content-wrapper">
+    {% if page.movedTo %}
+    <aside class="warning">
+      The content of this page is outdated. Click <a href="{{ page.movedTo }}">here</a> to find the up to date version of this page.
+    </aside>
+    {% endif %}
     {{ content }}
 </div>
 <script>