Remove style for deleted elements
Remove style for deleted elements

The `.global-cookie-message` and `.footer-nav`
classes were for elements in the govuk_template.
This used to be the base layout for this app but
was changed here:

https://github.com/alphagov/notifications-admin/pull/3198

alphagov/notifications-admin,alphagov/notifications-admin,alphagov/notifications-admin,alphagov/notifications-admin