Update configuration-cookbook.md

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Author: thomasr8

jekyll/_cci2/configuration-cookbook.md

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 ## Deploying Software Changes to Amazon ECS
 
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 The Amazon Elastic Container Service (ECS) is a scalable container orchestration service that enables you to support Docker containers and allows you to run and scale containerized applications on AWS. By using Amazon ECS, you will be able to use this service without installing and configuring your own container orchestration software, thereby eliminating the complexity of your deployment and ensuring you have a simple and optimized container deployment on the CircleCI platform. Although this documentation enables you to quickly and easily deploy software changes to the Amazon ECS service using CircleCI orbs, if you would like more detailed information about the how Amazon ECS service works, and its underlying components and architecture, please refer to the [Amazon ECS]( https://docs.aws.amazon.com/AmazonECS/latest/developerguide/Welcome.html) documentation.
 
 ### Prerequisites
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 ## Deploying Software Changes to Google Kubernetes Engine (GKE)
 
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 The Google Kubernetes Engine (GKE) enables you to automate CI/CD strategies to quickly and easily deploy code and application updates to your customers without requiring significant time to deliver these updates. Using the GKE, CircleCI has leveraged this technology, along with development of a GKE-specific CircleCI orb, to enable you to interact with GKE within a specific job. Before working with GKE, you may wish to read Google's technical documentation, which can be found on the [GKE](https://cloud.google.com/kubernetes-engine/docs/) documentation page.
 
 ### Prerequisites
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 The Heroku platform is a cloud-based, fully-scalable platform that enables you to quickly and easily deliver and deploy applications. Using CircleCI builds and orbs, you can simplify the deployment process in a few simple steps by following the steps described in the sections below.
 
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 ### Prerequisites
 
 Before you can deploy an applications to the Heroku platform, make sure the following requirements are met:
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 Slack is a real-time collaboration application where team members can work together to perform routine tasks and projects through custom channels and workspaces. When using the CircleCI platform, you may find it useful to enable custom notifications with the Slack app based on specific team needs and requirements.
 
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 ### Prerequisites
 
 Before enabling custom notifications in Slack while using the CircleCI platform, ensure your environment is properly configured and setup to leverage the CircleCI platform and orbs.