https://happykite.co.uk/changing-continue-shopping-link-within-woocommerce/
https://stackoverflow.com/questions/43946264/override-external-product-url-to-add-to-cart-product-button
https://docs.woocommerce.com/documentation/plugins/woocommerce/woocommerce-codex/theming/
http://www.potopoto.be/secondome/?product=white-shadow-collection
https://theme.co/apex/forums/topic/adding-a-button-in-a-single-product-page-woocommerce/