* Use GH container registry images
* Change images in constant
* Update nigiri images constants
* Remove checks to print the version of nigiri CLI
* add fallbackfee to bitcoin.conf & elements.conf
* commented bitcoin push test
* changes for new version of esplora image
* add electrs port and esplora url env vars in compose yaml files
* wrap viper methods into Config type and use constants package
* add controller to interact with nigiri resources:
* .env for docker-compose
* docker daemon
* json config file
* add use of constants and config packages and change start flag from --port to --env
* add package for global constants and variables
* add use of controller and constants packages instead of local methods and vars
* bump version
* use contants in logs command tests
