Frontend: Update challenge-list.html to improve accessibility and navigation by adding an ID to the challenge list section and updating the scroll-to button target. (#4974)

Author: RishabhJain2018

frontend/src/views/web/challenge-list.html

@@ -1,4 +1,4 @@
-<section class="ev-sm-container ev-view challenge-container">
+<section id="challenge-list-top" class="ev-sm-container ev-view challenge-container">
     <p class="text-med-black fs-30 no-margin">All Challenges</p>
     <!-- tabs for challenges -->
     <div class="row">
@@ -54,7 +54,7 @@
 
     <!-- scroll up button -->
     <div id = "scroll-up" ng-class="challengeList.scrollUp()" >
-    <a class="ev-btn-scroll" scroll-to= "ongoing-challenges" offset= "800"><strong><i class="align-right fa fa-chevron-up"></i></strong></a>
+    <a class="ev-btn-scroll" scroll-to="challenge-list-top" offset="800"><strong><i class="align-right fa fa-chevron-up"></i></strong></a>
     </div>
 
     <!-- simple loader -->