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[Feature Request] Add EFS Support

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## Context AWS recently announced the ability to attach EFS (Elastic File System) to lambda instances ([more info](https://aws.amazon.com/about-aws/whats-new/2020/06/aws-lambda-support-for-amazon-elastic-file-system-now-generally-/)). It would be great if Zappa offered the ability to attach an...

AWS NAT Instance AMI no longer supported

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### Describe the Bug It seems AWS no longer offers a NAT instance AMI. When `nat_instance_enabled=true`, it causes > Error: Your query returned no results. Please change your search criteria...

### Use case I'm going through a first time setup, and after running `cloudfront-hosting-toolkit deploy`, I receive the following error: ``` [ERROR] Impossible to connect to your the AWS account....