EPIC: Apply a custom promo code and discount to AP purchase

[griebelr]

Update the content on the adventurepass.us web site:

• [ ] Change header to say "Camp all year with the exclusive Adventure Pass"
• [ ] Remove the block "INTRODUCTORY OFFER IF YOU ACT NOW"
• [ ] Add a block that says "SAVE UP TO $5000 ON CAMPING THIS YEAR"
• [ ] Change price block to say "Only $599"
• [ ] Remove block that says "reg. $500"
• [ ] Remove the time ticker.
• [ ] Change the call to action button to 'START CAMPING TODAY!'

On ALL Paid Pass purchase pages:

• [ ] Remove the automatic Introductory $100 discount and modal.
• [ ] Create an index where custom discounts are created and stored.
• [ ] Each code will have it's own discount dollar amount.
• [ ] Multiple discount codes can have the same discount dollar amount.
• [ ] Allow users to enter a custom discount code on the purchase page below the billing cycle and above the credit card info.
• [ ] Enter code - APPLY
• [ ] Validate the code against the index.
• [ ] Message if code matches active discount: Discount applied successfully.
• [ ] Message if code does not match an active discount or code is inactive: We're sorry, this is not a valid code.
• [ ] Apply the matching custom discount dollar amount based on the code they enter into the invoice section.
• [ ] Maintain rule for Monthly billing cycle - discount is not available. Do not show discount code field if Monthly is selected.