Hey @LKNickname, try this out:
const { iconNode } = require("discourse-common/lib/icon-library");
api.decorateWidget("header-icons:before", helper => {
return helper.h("li", [
helper.h(
"a#globe-button.icon",
{
href: "https://www.website.com/",
title: "Back to website"
},
iconNode("globe")
)
]);
});