Add List and Roadmap sub-links under Epics

ee/app/views/layouts/nav/ee/_epic_link.html.haml

 - return unless group.feature_available?(:epics)
 
 - epics = EpicsFinder.new(current_user, group_id: @group.id).execute
-- epics_items = ['epics#show', 'epics#index']
+- epics_items = ['epics#show', 'epics#index', 'roadmap#show']
 
 = nav_link(path: epics_items) do
   = link_to group_epics_path(group) do
@@ -10,9 +10,16 @@
     %span.nav-item-name
       Epics
     %span.badge.count= number_with_delimiter(epics.count)
-  %ul.sidebar-sub-level-items.is-fly-out-only
+  %ul.sidebar-sub-level-items
     = nav_link(path: epics_items, html_options: { class: "fly-out-top-item" } ) do
       = link_to group_epics_path(group) do
-        %strong.fly-out-top-item-name
-          #{ _('Epics') }
+        %strong.fly-out-top-item-name= _('Epics')
         %span.badge.count.epic_counter.fly-out-badge= number_with_delimiter(epics.count)
+    %li.divider.fly-out-top-item
+    = nav_link(path: 'epics#index', html_options: { class: 'home' }) do
+      = link_to group_epics_path(group), title: 'List' do
+        %span= _('List')
+
+    = nav_link(path: 'roadmap#show', html_options: { class: 'home' }) do
+      = link_to group_roadmap_path(group), title: 'Roadmap' do
+        %span= _('Roadmap')