Bank mock test sites

Local and deployed entry points for each bank's DOM-scraping test fixture.

• American Express

  http://amex.localhost:3000/offers/eligiblehttps://amex.lifeflow-ai.com/offers/eligible

• Chase

  http://chase.localhost:3000/merchantOffers/offer-hub#/dashboard/merchantOffers/offer-hub?accountId=mock-acct-1https://chase.lifeflow-ai.com/merchantOffers/offer-hub#/dashboard/merchantOffers/offer-hub?accountId=mock-acct-1

No /etc/hosts entry yet for one of these? See docs/test_infra/bank_mockup_site.md in the Reward repo for the entries to add.