add sitemap to 404

_pages/404.md

@@ -21,3 +21,34 @@ canonical_url: 'https://infominer.id/DIDecentralized/404.html'
   <li><a href="https://infominer.id/learn-crypto-trading/">https://infominer.id/learn-crypto-trading/</a></li>
 </ul></p>
 </div>
+
+<h2>Sitemap</h2>
+
+A list of all the posts and pages found on the site. For you robots out there is an [XML version]({{ "sitemap.xml" | relative_url }}) available for digesting as well.
+
+<h2>Pages</h2>
+{% for post in site.pages %}
+  {% include archive-single.html %}
+{% endfor %}
+
+<h2>Posts</h2>
+{% for post in site.posts %}
+  {% include archive-single.html %}
+{% endfor %}
+
+{% capture written_label %}'None'{% endcapture %}
+
+{% for collection in site.collections %}
+{% unless collection.output == false or collection.label == "posts" %}
+  {% capture label %}{{ collection.label }}{% endcapture %}
+  {% if label != written_label %}
+  <h3>{{ label }}</h3>
+  {% capture written_label %}{{ label }}{% endcapture %}
+  {% endif %}
+{% endunless %}
+{% for post in collection.docs %}
+  {% unless collection.output == false or collection.label == "posts" %}
+  {% include archive-single.html %}
+  {% endunless %}
+{% endfor %}
+{% endfor %}