TASK: Add `dynaconf` to the project

[widal001]

Summary

Add dynaconf to the list of dependencies and set up configuration management using dynaconf

To Do

• Add dynaconf to project dependencies
• Set up dynaconf files using dynaconf init
• Add details about dynaconf and config management to the README.md

Definition of Done

• dynaconf is setup for new projects as soon as users of this template create a new repo and install the package
• The README.md describes how to set up .secrets.toml file for secret configuration