remove redundant back button!

Author: Anass Rach

assets/quizzes/java21-quiz.html

@@ -284,9 +284,7 @@
     <div class="quiz-container">
         <div class="quiz-header">
             <h1>Java 21 OCP Quiz</h1>
-            <p>Test your knowledge of Java 21 OCP exam topics</p><br>
-			    <button class="btn btn-primary" onclick="window.location.href='/java21docCards/'">
-					Back to Flashcards </button>
+            <p>Test your knowledge of Java 21 OCP exam topics</p>
         </div>
 
         <div class="quiz-body">