add login/sign-up page with dark/light mode

node_modules/object.groupby/implementation.js

@@ -0,0 +1,20 @@
+'use strict';
+
+var CreateDataPropertyOrThrow = require('es-abstract/2024/CreateDataPropertyOrThrow');
+var OrdinaryObjectCreate = require('es-abstract/2024/OrdinaryObjectCreate');
+
+var forEach = require('es-abstract/helpers/forEach');
+
+var GroupBy = require('es-abstract/2024/GroupBy'); // TODO: replace with es-abstract 2024 implementation
+
+module.exports = function groupBy(items, callbackfn) {
+	var groups = GroupBy(items, callbackfn, 'PROPERTY'); // step 1
+
+	var obj = OrdinaryObjectCreate(null); // step 2
+
+	forEach(groups, function (g) { // step 3
+		CreateDataPropertyOrThrow(obj, g['[[Key]]'], g['[[Elements]]']); // steps 3.a - 3.b
+	});
+
+	return obj; // step 4
+};