fix(INavData): add missing href for explicit external links

Author: xidedix

projects/coreui/angular/src/lib/sidebar/app-sidebar-nav.ts

@@ -35,6 +35,7 @@ export interface INavLinkProps {
 export interface INavData {
   name?: string;
   url?: string | any[];
+  href?: string;
   icon?: string;
   badge?: INavBadge;
   title?: boolean;