feat(sharing): Opt Out WIP

First draft of support for opting out of future modal display on specific events, and adds the second barebones target page for sharing.

website/src/models/user.js

@@ -377,6 +377,12 @@ var UserSchema = new Schema({
       // Those importantAnnouncements are in fact the recapture emails
       importantAnnouncements: {type: Boolean, 'default': true},
       weeklyRecaps: {type: Boolean, 'default': true}
+    },
+    suppressModals: {
+      levelUp: {type: Boolean, 'default': false},
+      hatchPet: {type: Boolean, 'default': false},
+      raisePet: {type: Boolean, 'default': false},
+      streak: {type: Boolean, 'default': false}
     }
   },
   profile: {