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

node_modules/array-includes/shim.js

@@ -0,0 +1,14 @@
+'use strict';
+
+var define = require('define-properties');
+var getPolyfill = require('./polyfill');
+
+module.exports = function shimArrayPrototypeIncludes() {
+	var polyfill = getPolyfill();
+	define(
+		Array.prototype,
+		{ includes: polyfill },
+		{ includes: function () { return Array.prototype.includes !== polyfill; } }
+	);
+	return polyfill;
+};