Add points functionality

[niamurrell]

Needs js click events
Needs function to interact with database, update points total

[niamurrell]

The click events are set up for this now, we just need to:

1. add in the custom text in the modals (depending on what deal was selected)
2. do the function that deducts/updates the user's points balance

[niamurrell]

Needs:

• All the deduction buttons work
• Limit redemption so you can't have negative points