Migrate from accounts.js to Firestore

[stdavis]

I should be a grown-up and use Firestore rather than a hard-coded JavaScript file.

Accounts would likely only need a few properties:

{
  "quadWord": "my-quad-word",
  "arcgisServer": "https://mapserv.utah.gov",
  "contact": "someone@test.com"
}

• migration script
• wire up app
• one-time migration from staging to prod database