update to img links

Existing links for the emojis are not working, hence have updated the links.
Not the exact same as previous, but reflects the feedback statement precisely

Thanks!

feedback-ui-design/index.html

@@ -12,17 +12,17 @@
       <strong>How satisfied are you with our <br /> customer support performance?</strong>
       <div class="ratings-container">
         <div class="rating">
-          <img src="https://image.flaticon.com/icons/svg/187/187150.svg" alt="">
+          <img src="https://img.icons8.com/external-neu-royyan-wijaya/64/000000/external-emoji-neumojis-smiley-neu-royyan-wijaya-17.png" alt="">
           <small>Unhappy</small>
         </div>
 
         <div class="rating">
-          <img src="https://image.flaticon.com/icons/svg/187/187136.svg" alt=""/>
+          <img src="https://img.icons8.com/external-neu-royyan-wijaya/64/000000/external-emoji-neumojis-smiley-neu-royyan-wijaya-3.png" alt=""/>
           <small>Neutral</small>
         </div>
 
         <div class="rating active">
-          <img src="https://image.flaticon.com/icons/svg/187/187133.svg" alt=""/>
+          <img src="https://img.icons8.com/external-neu-royyan-wijaya/64/000000/external-emoji-neumojis-smiley-neu-royyan-wijaya-30.png" alt=""/>
           <small>Satisfied</small>
         </div>
       </div>