fix: correct section class for consistency

Updated class selector from '.section' to '.course-section' to ensure consistency with the rest of the codebase and avoid potential conflicts or mismatches. This change helps in maintaining uniformity and readability in the script.

script.js

@@ -212,7 +212,7 @@
             );
           });
 
-          var sections = $('.section');
+          var sections = $('.course-section');
           var found = false;
 
           sections.each(function (index) {