feat(darkfish): Add Attributes section to TOC and sidebar

lib/rdoc/generator/template/darkfish/_sidebar_attributes.rhtml

@@ -0,0 +1,12 @@
+<%- unless klass.attributes.empty? then %>
+<!-- Method Quickref -->
+<div id="attribute-list-section" class="nav-section">
+  <h3>Atributes</h3>
+
+  <ul class="link-list" role="directory">
+    <%- klass.attributes.each do |attribute| -%>
+      <a href="#<%= attribute.aref %>"><%= h attribute.name -%></a>
+    <%- end -%>
+  </ul>
+</div>
+<%- end -%>

lib/rdoc/generator/template/darkfish/class.rhtml

@@ -12,6 +12,7 @@
     <%= render '_sidebar_parent.rhtml' %>
     <%= render '_sidebar_includes.rhtml' %>
     <%= render '_sidebar_extends.rhtml' %>
+    <%= render '_sidebar_attributes.rhtml' %>
     <%= render '_sidebar_methods.rhtml' %>
   </div>
 </nav>

lib/rdoc/generator/template/darkfish/table_of_contents.rhtml

@@ -45,6 +45,18 @@
 <%- end -%>
 </ul>
 
+<h2 id="attributes">Attributes</h2>
+<ul>
+<%- @store.all_classes_and_modules.flat_map do |mod|
+     mod.attributes
+   end.sort.each do |attribute| %>
+  <li class="attribute">
+    <a href="<%= attribute.path %>"><%= h attribute.pretty_name %></a>
+    &mdash;
+    <span class="container"><%= attribute.parent.full_name %></span>
+<%- end -%>
+</ul>
+
 <h2 id="methods">Methods</h2>
 <ul>
 <%- @store.all_classes_and_modules.flat_map do |mod|