Update web/index.html

web/index.html

@@ -25,8 +25,15 @@
     <link rel="stylesheet" href="css/jquery.timepicker.css">
     <link rel="stylesheet" href="css/quill.snow.css">
     <link rel="stylesheet" href="css/daterangepicker.css">
-    <link rel="stylesheet" href="css/app-light.css" id="lightTheme">
-    <link rel="stylesheet" href="css/app-dark.css" id="darkTheme" disabled
+    <script>
+      (function() {
+        var dark = localStorage.getItem('theme') === 'dark';
+        document.write(
+          '<link rel="stylesheet" href="css/app-' + (dark ? 'dark' : 'light') + '.css" id="' + (dark ? 'dark' : 'light') + 'Theme">' +
+          '<link rel="stylesheet" href="css/app-' + (dark ? 'light' : 'dark') + '.css" id="' + (dark ? 'light' : 'dark') + 'Theme" disabled>'
+        );
+      })();
+    </script>
 
  
 </head>