Remove powered by django jet label

jet/static/jet/css/_sidebar.scss

@@ -10,7 +10,6 @@
   background-color: $sidebar-background-color;
   color: $sidebar-text-color;
   transition: background-color $transitions-duration;
-  padding-bottom: 32px;
 
   @include for-mobile {
     width: 360px;

jet/templates/admin/base.html

@@ -312,7 +312,6 @@
                     </div>
                 {% endif %}
             </div>
-            <div class="sidebar-copyright">powered by DJANGO JET</div>
 
             {% if app_list and not SIDE_MENU_COMPACT %}
                 <div class="sidebar-popup-container">