credit the dark theme switch script

assets/theme.js

+// credit AdminLTE, original code here: https://github.com/ColorlibHQ/AdminLTE/blob/master/docs/_includes/foot.html
+
 var toggleSwitch = document.querySelector('.theme-switch input[type="checkbox"]');
 var currentTheme = localStorage.getItem('theme');
 var mainHeader = document.querySelector('.main-header');