add suppliers/lists ui styling and security fixes

app/controllers/supplier_controller.rb

@@ -111,15 +111,4 @@ class SupplierController < ApplicationController
     @order.is_delivered!
     render nothing: true
   end
-
-  # GET /supplier/lists/1
-  def show_list
-    @list = List.find_by_supplier_id_and_id(current_supplier.id, params[:list_id])
-    respond_to do |format|
-      format.html {}
-      format.json do
-        render json: @list.with_orders_as_json
-      end
-    end
-  end
 end