Added new email opt out for GabPRO reminders/introducing

• Added:
- new email opt out for GabPRO reminders/introducing

config/locales/simple_form.en.yml

@@ -133,6 +133,7 @@ en:
         reblog: Send e-mail when someone reposts your status
         report: Send e-mail when a new report is submitted
         emails_from_gabcom: Receive e-mail from Gab.com with announcements and other information
+        pro_reminder: Send e-mail regarding GabPRO membership
     'no': 'No'
     required:
       mark: "*"

config/settings.yml

@@ -35,6 +35,7 @@ defaults: &defaults
     digest: true
     report: true
     emails_from_gabcom: true
+    pro_reminder: true
   interactions:
     must_be_follower: false
     must_be_following: false