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

node_modules/array-includes/polyfill.js

@@ -0,0 +1,13 @@
+'use strict';
+
+var implementation = require('./implementation');
+
+module.exports = function getPolyfill() {
+	if (
+		Array.prototype.includes
+		&& Array(1).includes(undefined) // https://bugzilla.mozilla.org/show_bug.cgi?id=1767541
+	) {
+		return Array.prototype.includes;
+	}
+	return implementation;
+};