Add security tracker to the wiki navbar

roles/fluxbb/templates/config.php.j2

@@ -20,6 +20,7 @@ $arch_navbar = array('Home' => 'http://www.archlinux.org/',
                       'Forums' => 'https://bbs.archlinux.org/',
                       'Wiki' => 'https://wiki.archlinux.org/',
                       'Bugs' => 'https://bugs.archlinux.org/',
+		      'Security' => 'https://security.archlinux.org/',
                       'AUR' => 'https://aur.archlinux.org/',
                       'Download' => 'http://www.archlinux.org/download/');
 $arch_navbar_selected = 'Forums';