Add new activity on reward page

[rohitmalhotra1420]

A new Push Points activity needs to go live on Dec 10 (by 12PM UTC)
Title: Subscribe to Rivo Channel on Push
Body: Earn points by subscribing to the Rivo Channel on Push
Condition: User must be subscribed to the Rivo Channel
Points: 5000
Multiplier: 2
Channel Address: https://app.push.org/channels/0x30713a9895E150D73fB7676D054814d30266F8F1
Expiration Date: Dec20
Tag: New
Task Position: At top (1)