Automatically collect all files in the doc folder

_config.yml

@@ -36,3 +36,7 @@ collections:
     output: true
     caption: Developers
     sidebar_index: 5
+  doc:
+    output: true
+    caption: Other
+    sidebar_index: 6

_layouts/sidebar.html

@@ -7,6 +7,8 @@ layout: default
             {% assign collections = site.collections | sort: "sidebar_index" %}
             {% for coll in collections %}
                 {% if coll.sidebar_index %}
+                    {% assign count = coll.docs | size %}
+                    {% if count <= 5 %}
                         <div class="list-group">
                             <a class="list-group-item active">{{ coll.caption }}</a>
                             {% for doc in coll.docs %}
@@ -15,6 +17,13 @@ layout: default
                                     {% include title.html doc=doc coll=coll %}</a>
                             {% endfor %}
                         </div>
+                    {% else %}
+                        {% capture url %}../{{ coll.label }}{% endcapture %}
+                        <div class="list-group">
+                            <a class="list-group-item active"
+                               href="{% include link.html url=url %}">{{ coll.caption }}</a>
+                        </div>
+                    {% endif %}
                 {% endif %}
             {% endfor %}
           </div>

doc.md

@@ -0,0 +1,7 @@
+---
+title: Other documents
+---
+
+{% for p in site.doc %}
+* [{{ p.title }}]({% include link.html url=p.url %})
+{% endfor %}