:gift: Update deploy script with values required for staging

[ShanaLMoore]

ISSUE

• https://github.com/scientist-softserv/adventist_knapsack/issues/293

Updates were made to match dev-deploy's way of doing things. ✅

ENV vars have been set up in settings/environment/staging ✅

TODO:

• Make a DNS in cloudflare, or have client set up a CNAME
• deploy to staging