Add a shipping tabs sub section partial

This partial will be responsible for configuration menu settings related
to shipping.

backend/app/views/spree/admin/shared/_shipping_tabs.html.erb

@@ -0,0 +1,17 @@
+<% content_for :tabs do %>
+ <nav>
+ <ul class="tabs" data-hook="admin_settings_shipping_tabs">
+ <% if can?(:display, Spree::ShippingMethod) %>
+ <%= settings_tab_item Spree::ShippingMethod.model_name.human(count: :other), admin_shipping_methods_path %>
+ <% end %>
+
+ <% if can?(:display, Spree::ShippingCategory) %>
+ <%= settings_tab_item Spree::ShippingCategory.model_name.human(count: :other), admin_shipping_categories_path %>
+ <% end %>
+
+ <% if can?(:display, Spree::StockLocation) %>
+ <%= settings_tab_item Spree::StockLocation.model_name.human(count: :other), spree.admin_stock_locations_path %>
+ <% end %>
+ </ul>
+ </nav>
+<% end %>