fix(templates): changed id to class

discuss_data/templates/nav-top.html

 {% load static i18n compress%}
-<nav class="navbar fixed-top flex-md-nowrap p-0 border-bottom" id="navbar-top">
+<nav class="navbar-top navbar fixed-top flex-md-nowrap p-0 border-bottom">
     <a class="navbar-brand col-sm-3 col-md-2 mr-0" href="#"><img src="{% static 'images/logo-primary.svg' %}" height="40" /></a>
     <input class="w-25 form-control" type="text" placeholder="Search" aria-label="Search">
     <ul class="navbar-nav px-3">