chore: import upstream snapshot with attribution

docs/_includes/documents-collection.html

@@ -0,0 +1,21 @@
+{% assign entries = site[include.collection] %}
+
+{% if include.sort_by == 'title' %}
+  {% if include.sort_order == 'reverse' %}
+    {% assign entries = entries | sort: 'title' | reverse %}
+  {% else %}
+    {% assign entries = entries | sort: 'title' %}
+  {% endif %}
+{% elsif include.sort_by == 'date' %}
+  {% if include.sort_order == 'reverse' %}
+    {% assign entries = entries | sort: 'date' | reverse %}
+  {% else %}
+    {% assign entries = entries | sort: 'date' %}
+  {% endif %}
+{% endif %}
+
+{%- for post in entries -%}
+  {%- unless post.hidden -%}
+    {% include archive-single.html %}
+  {%- endunless -%}
+{%- endfor -%}