Set cookie duration to 365 days based on the AEPD's cookie usage guidelines.
Note from the document: "Cookies with a duration of up to 24 months are
considered acceptable as long as they are periodically updated."
Reference: https://www.aepd.es/guias/guia-cookies.pdf
Allow enabling from settings admin section.
Note that we set the z-index to 20 in order to will be greater than
the others z-index elements in the application like <header> on
mobile devices.
