Update Billing Page for Auto-renew use case

Changes illustrated in this design:

Added the notification on top, saying "there's nothing you need to do, we'll let you know when the renewal is complete", and that they can update their number of seats and credit card info + CTA
Changed the Subscription end date label to Subscription auto-renewal date
Added a cell with Estimated amount + explanation that it may still change
Added the credit card info (this is done once a year, it may happen that they'll need to update this so we should tell them which card was used until now)