Change text-muted class to text class in welcome.html

Author: commjoen

src/main/resources/templates/welcome.html

@@ -33,7 +33,7 @@ <h5 class="alert-heading">🎯 How to Play</h5>
             <div class="row">
                 <div class="col-12 col-lg-7">
                     <div class="mb-3">
-                        <small class="text-muted">
+                        <small class="text">
                             <strong>Difficulty:</strong> ⭐ (Easy) ⭐⭐ (Medium) ⭐⭐⭐ (Hard) ⭐⭐⭐⭐ (Expert) ⭐⭐⭐⭐⭐ (Master) |
                             <strong>Environment:</strong> Where the challenge can be solved
                         </small>