Update README.md and docs (#88)

Co-authored-by: aknysh <[email protected]>

README.md

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 # terraform-aws-alb [![Latest Release](https://img.shields.io/github/release/cloudposse/terraform-aws-alb.svg)](https://github.com/cloudposse/terraform-aws-alb/releases/latest) [![Slack Community](https://slack.cloudposse.com/badge.svg)](https://slack.cloudposse.com)
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 Terraform module to create an ALB, default ALB listener(s), and a default ALB target and related security groups.
 
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 This project is part of our comprehensive ["SweetOps"](https://cpco.io/sweetops) approach towards DevOps.
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 ## Security & Compliance [<img src="https://cloudposse.com/wp-content/uploads/2020/11/bridgecrew.svg" width="250" align="right" />](https://bridgecrew.io/)
 
 Security scanning is graciously provided by Bridgecrew. Bridgecrew is the leading fully hosted, cloud-native solution providing continuous Terraform security and compliance.