Developer Tools guide: spring cleaning
Developer Tools guide: spring cleaning

 * Remove a section on Web Messaging since
   SockJS is no longer supported and Web MQTT,
   Web STOMP are an integral part of the rest
   of the docs. Both ship with the RabbitMQ
   distribution.
 * Clarifications

rabbitmq/rabbitmq-website,rabbitmq/rabbitmq-website,rabbitmq/rabbitmq-website,rabbitmq/rabbitmq-website,rabbitmq/rabbitmq-website