* BAH-1444 | Added. config file and shell script to read and replace env variable during docker runtime

* BAH-1444 | Refactor. removed build-args in ci.yml

* BAH-1444 | Refactor. update Config file

* BAH-1444 | Refactor. updated entrypoint scripts and webpack config

Co-authored-by: Kavitha S <kavitha.s@thoughtworks.com>

* BAH-1444 | Refactor. updated dockerfile

Co-authored-by: Kavitha S <kavitha.s@thoughtworks.com>

* BAH-1444 | Refactor. extracted path in script file

Co-authored-by: Kavitha S <kavitha.s@thoughtworks.com>

* BAH-1444 | Refactor. renamed environment variables in Config

Co-authored-by: Kavitha S <kavitha.s@thoughtworks.com>

* BAH-1444 | Refactor. updated Readme

Co-authored-by: Kavitha S <kavitha.s@thoughtworks.com>

* BAH-1444 | Refactor. placeholder for backend base url

Co-authored-by: Kavitha S <kavitha.s@thoughtworks.com>