Docs Update - Instructions for deploying to AWS

This includes Docs updates to deploy Syte to AWS using Elastic Beanstalk.  This update also includes the .ebextensions/syte.config file which is needed for this process and an addition to the .gitignore so that the .elasticbeanstalk directory, which should remain private, is not inadvertently committed to someone's repo.  Let me know what you think or if you have any suggestions for changes.