[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

Gemfile

@@ -80,19 +80,14 @@ group :development do
   gem 'web-console'
 end
 
-group :test do
-  gem 'action-cable-testing'
-  gem 'mock_redis'
-  gem 'shoulda-matchers'
-  gem 'simplecov', require: false
-end
-
 group :development, :test do
+  gem 'action-cable-testing'
   gem 'bundle-audit', require: false
   gem 'byebug', platform: :mri
   gem 'factory_bot_rails'
   gem 'faker'
   gem 'listen'
+  gem 'mock_redis'
   gem 'pry-rails'
   gem 'rspec-rails', '~> 4.0.0.beta2'
   gem 'rubocop', require: false
@@ -100,6 +95,8 @@ group :development, :test do
   gem 'rubocop-rails', require: false
   gem 'rubocop-rspec', require: false
   gem 'seed_dump'
+  gem 'shoulda-matchers'
+  gem 'simplecov', require: false
   gem 'spring'
   gem 'spring-watcher-listen'
 end