Add cancancan to SDG content

Only allow access to the SDG content section to administrators and sdg managers

app/controllers/sdg_management/goals_controller.rb

@@ -1,5 +1,7 @@
 class SDGManagement::GoalsController < SDGManagement::BaseController
+  load_and_authorize_resource class: "SDG::Goal"
+
   def index
-    @goals = SDG::Goal.order(:code)
+    @goals = @goals.order(:code)
   end
 end