Correction ascenseur bas de page

blog/templates/blog/footer.html

 <!-- Footer -->
 <footer class="text-center">
   <a class="up-arrow" href="#myPage" data-toggle="tooltip" title="TO TOP">
-    <span class="glyphicon glyphicon-chevron-up"></span>
+    <i class="fa fa-2x fa-angle-up" aria-hidden="true"></i>
   </a>
   <div class="social-icons">
     <a class="facebook" href="https://www.facebook.com/GalaDePrestigeUTBM"><i class="fa fa-facebook"></i></a>