fix(sidebar.pug): split icons/flags li.nav-item

Author: xidedix

pug/partials/sidebar.pug

@@ -123,6 +123,7 @@
                 i.nav-icon.icon-star
                 |  CoreUI Icons
                 span.badge.badge-success NEW
+            li.nav-item
               a.nav-link(href='icons/flags.html')
                 i.nav-icon.icon-star
                 |  Flags