[Enhancement] Docker support Debugging (byebug & pry) and receive emails to MailHog via smtp (#371)

* updated development docker setup

* turned on yarn integrity check

* create test docker compose and update development dockerfile

* create docker Readme.md file

* fix README.md file

* create docker-copmose and dockerfile for production/staging environment setup

* added mailhog to catch email

* remove yarn integrity check in development mode!

* Update Readme.md file to support mailhog inbox

* update link to docker development guide from mail README

* remove .env.development and use .env.example for docker as .env.development was mixing with circleci config

* make the dockerfile configurable like before

* update docker-compose as per suggesion in PR

* create docker setup docs

* Revert accidental deletion

* fix: typo for branding consistency

* fix typo

* update the code as per recommendation in PR

* remove package-lock and add gitignore

* fix vulnerability AND update env for tests to pass

* Fix yarn integrity check across different docker services

* update code based on rubocop and PR suggestions

* remove redundant test docker-compose and dockerfile

* update rails entrypoint, update docs and Gemfile

* [Rubocop] order Gemfile alphabetically

* Reordering Gemfile

README.md

@@ -53,7 +53,9 @@ You can use our official Docker image from [https://hub.docker.com/r/chatwoot/ch
 docker pull chatwoot/chatwoot
 ```
 
-Follow our [environment variables](https://www.chatwoot.com/docs/environment-variables/) guide to setup environment for Docker
+Follow our [environment variables](https://www.chatwoot.com/docs/environment-variables/) guide to setup environment for Docker.
+
+Follow our [docker development guide](docker/README.md) to develop and debug the application using docker composer.
 
 ## Contributors ✨