Use dotenv to load .env configurations

Gemfile

@@ -28,6 +28,7 @@ gem "sentry-raven"
 group :development, :test do
   # Call 'byebug' anywhere in the code to stop execution and get a debugger console
   gem 'byebug', platforms: [:mri, :mingw, :x64_mingw]
+  gem 'dotenv-rails'
 end
 
 group :development do