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

node_modules/node-exports-info/getRange.js

@@ -0,0 +1,19 @@
+'use strict';
+
+var $RangeError = require('es-errors/range');
+var entries = require('object.entries');
+
+var ranges = require('./ranges');
+
+/** @type {import('./getRange')} */
+module.exports = function getRange(category) {
+	var rangeEntries = entries(ranges);
+	for (var i = 0; i < rangeEntries.length; i += 1) {
+		var entry = rangeEntries[i];
+		if (entry[1] === category) {
+			return entry[0];
+		}
+	}
+
+	throw new $RangeError('no version range found for category ' + category);
+};