Update extlink settings

config/default/sync/extlink.settings.yml

-extlink_include: ''
-extlink_exclude: ''
-extlink_alert_text: ''
 extlink_alert: false
-extlink_target: true
-extlink_subdomains: true
-extlink_mailto_class: mailto
-extlink_img_class: false
+extlink_alert_text: 'This link will take you to an external web site. We are not responsible for their content.'
 extlink_class: ext
 extlink_css_exclude: ''
 extlink_css_explicit: ''
+extlink_exclude: ''
+extlink_follow_no_override: true
+extlink_font_awesome_classes: {  }
+extlink_icon_placement: append
+extlink_img_class: false
+extlink_include: ''
+extlink_label: '(link is external)'
+extlink_mailto_class: mailto
+extlink_mailto_label: '(link sends email)'
+extlink_nofollow: true
+extlink_subdomains: true
+extlink_target: true
+extlink_target_no_override: true
+extlink_use_font_awesome: false
+whitelisted_domains: {  }