removes retired proposals from default index

adds a sidebar link to retired proposals list

app/views/proposals/index.html.erb

@@ -22,6 +22,8 @@
             <%= page_entries_info @proposals %>
             <%= t("proposals.index.filter_topic", count: @proposals.size, topic: @tag_filter) %>
           </h2>
+        <% elsif params[:retired].present? %>
+          <h2><%= t("proposals.index.retired_proposals") %>
         <% end %>
       </div>
 
@@ -57,6 +59,7 @@
         <%= render 'categories' %>
         <%= render 'geozones' %>
         <%= render 'popular' %>
+        <%= render 'retired' %>
       </aside>
     </div>