udpate brand new UI version 3

Author: ProRasel

about-us.html

@@ -36,7 +36,7 @@
               <nav class="text-right">
                 <ul>
                   <li><a href="index.html">Home</a></li>
-                  <li><a href="https://play.google.com/store/apps/details?id=com.learnprogramming.codecamp">App</a></li>
+                  <li><a href="https://app.programming-hero.com/">App</a></li>
                   <li><a href="https://web.programming-hero.com/">Courses</a></li>
                   <li><a href="https://web.programming-hero.com/success">Hire from Us</a></li>
                   <li><a href="about-us.html">About Us</a></li>