Add outdated flag

Author: lcharette

app/templates/pages/chapter.html.twig

@@ -7,6 +7,7 @@
     <div class="chapter-content">
         {% include "partials/wip.html.twig" %}
         {% include "partials/obsolete.html.twig" %}
+        {% include "partials/outdated.html.twig" %}
         {{ page.getContent()|version_paths(page.getVersion())|raw }}
     </div>
 {% endblock %}

app/templates/pages/docs.html.twig

@@ -9,6 +9,7 @@
         {% include "partials/tags.html.twig" %}
         {% include "partials/wip.html.twig" %}
         {% include "partials/obsolete.html.twig" %}
+        {% include "partials/outdated.html.twig" %}
         {{ page.getContent()|version_paths(page.getVersion())|raw }}
     </div>
 {% endblock %}

app/templates/partials/outdated.html.twig

@@ -0,0 +1,6 @@
+{% if page.getFrontMatter().outdated %}
+    <div class="uk-alert uk-alert-warning">
+        <p class="uk-alert-title"><i class="fa-solid fa-clock uk-icon"></i>Outdated page</p>
+        <p>This page may be outdated and could benefit from updates. You can help by <a href="{{ page.github }}">contributing on GitHub</a>.</p>
+    </div>
+{% endif %}