Remove referral notifications

[SatsAllDay]

Description
Forked from this comment on #1044.

With the changes to how referrals work, notifications for new referrals show up back when the referred user was created, which means they are often not in view when you view your own notifications at /notifications.

Steps to Reproduce

1. As user 1, follow a referral link from user 2
2. As user 2, check your notifications, see no corresponding notification

Expected behavior
The new referral notification should be at the top of the notifications page

Screenshots
I didn't capture any.

Logs
N/A

Environment:
N/A

Additional context
@ekzyis outlined the cause of the bug here

[huumn]

In line with our plans outlined in #1044 we will probably be removing these notifications, so I'm going to close. But if we do end up going back to the Old Ways, we'll rehydrate this.

So perhaps this issue should be about removing notifications for referrals?

[tsmith123]

@huumn Is this a case of ripping out everything to do with noteInvites or is there a bit more to it than that?

[huumn]

Yep! That should be all that this requires.