fix: user ID, codechef ID typo fix (#122)

* Update index.html

->user ID of Shreyans was wrong

* Update index.html

</a> was not closed in shreyans part

* Update index.html

added mohak's codechef ID

* Update index.html

fix: Shreyans codechef hyperlink fixed and added Mohak's codechef ID

Author: tkshsbcue

index.html

@@ -4194,6 +4194,7 @@ <h6>Marketing Team</h6>
                 <span class="more">+</span>
                 <div class="details">
                   <h6><a href="https://github.com/jmohak2004" target="_blank">GitHub: @jmohak2004</a></h6>
+                   <h6><a href="https://www.codechef.com/users/mohak3345" target="_blank">Codechef: @mohak3345</a></h6>
                   <div class="actions">
                     <a href="" class="button md-close"></a>
                   </div>
@@ -4213,7 +4214,7 @@ <h6>Marketing Team</h6>
                 <span class="more">+</span>
                 <div class="details">
                   <h6><a href="https://github.com/Percobain" target="_blank">GitHub: @Percobain</a></h6>
-                  <h6><a href="https://www.codechef.com/users/bprcobain" target="_blank">Codechef: @percobain/a></h6>
+                  <h6><a href="https://www.codechef.com/users/percobain" target="_blank">Codechef: @percobain</a></h6>
                   <div class="actions">
                     <a href="" class="button md-close"></a>
                   </div>
@@ -5554,4 +5555,4 @@ <h1>Our College</h1>
 
 </body>
 
-</html>
+</html>