- updated package-lock
- include sample .env file for easy reference
- continue to support key-by-key updating from credentials.js for now
- minor code formatting
- reflect status of BTCEXP_NO_RATES in UI when applicable (hide new exchanged-currency items from display dropdown and hide exchange rate on homepage)
- rename _LOGIN to _BASIC_AUTH_PASSWORD for clarity
- tweak README to call out .env-sample