Remove duplicate functionality

- remove customer hosting package list
- replace useless dashboard with redirect
- move all hosting package list for superuser to top level menu item
- replace btn-default with btn-secondary
- improve email address management page

gnuviechadmin/templates/websites/website_confirm_delete.html

@@ -36,7 +36,7 @@
                   method="post" class="form">
                 {% csrf_token %}
                 <input class="btn btn-warning" type="submit" value="{% translate "Yes, do it!" %}"/>
-                <a class="btn btn-default" href="{{ hostingpackage.get_absolute_url }}">{% translate "Cancel" %}</a>
+                <a class="btn btn-secondary" href="{{ hostingpackage.get_absolute_url }}">{% translate "Cancel" %}</a>
             </form>
         </div>
     </div>