feat good_job/shared/_secondary_navbar.erb: task bensheldon#1183

Add border-bottom,
Remove footer class,
change the html element to a better context,
change id and data live poll region context. This is used in live_poll.js only. LivePoll.js take each data attribute to replace in the same place with new dom elements, so there is no risk to brake another page dynamism.

app/views/good_job/shared/_secondary_navbar.erb

@@ -1,4 +1,4 @@
-<footer class="footer mt-auto py-3 bg-body-tertiary border-top text-muted small" id="footer" data-live-poll-region="footer">
+<nav class="mt-auto py-3 bg-body-tertiary border-bottom text-muted small" id="secondary-navbar" data-live-poll-region="secondary-navbar">
   <div class="container-fluid">
     <div class="row">
       <div class="col-6">
@@ -10,4 +10,4 @@
       </div>
     </div>
   </div>
-</footer>
+</nav>