There needs to be an export button above the orders list, and when clicked it should export a list of orders in .xls format.

Users should be able to export orders from the system.

As a sales manager, I need to be able to analyse the last month worth of orders in order that I can see which products are selling most.

Given I am logged in as an admin, when I press the export button then a .xls file should be downloaded with a list of orders for the past month.

As a user, I need to be able to export orders from the system.