[FEATURE] Support dotenv or something similar

[noinarisak]

Is your feature request related to a problem? Please describe.
Currently, this demo has hard-coded variables.

Describe the solution you'd like
Use dotenv, or something similar, to make it easier to deploy in the future.

Describe alternatives you've considered
n/a

Additional context
n/a

[noinarisak]

Looking promising https://github.com/goatandsheep/react-native-dotenv, which was mention https://reactnative.dev/docs/security.