Add form to authenticator page

assets/js/clipboard_utils.js

@@ -0,0 +1,12 @@
+function copyToClipboard(str) {
+	const input = document.createElement("input");
+	input.value = str;
+
+	document.body.appendChild(input);
+
+	input.select();
+	input.setSelectionRange(0, str.length);
+	document.execCommand("copy");
+
+	input.remove();
+}