update offline.html title

Author: Akshit

public/offline.html

@@ -5,7 +5,7 @@
     <meta charset="UTF-8">
     <meta http-equiv="X-UA-Compatible" content="IE=edge">
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
-    <title>CSE CREW</title>
+    <title>FRONTEND STUDY GROUP</title>
     <style>
         .offline-div{
             display: flex;