docs/resource/aws_lightsail_instance: Remove hardcoded blueprints list and add reference to AWS CLI command (#15779)
docs/resource/aws_lightsail_instance: Remove hardcoded blueprints list and add reference to AWS CLI command (#15779)

* update the list of blueprint IDs supported by aws_lightsail_instance

* update documentation for aws_lightsail_instance regarding blueprint IDs

In order to avoid the list of supported blueprint IDs be continually out of date the following changes were made:

* remove the Blueprints section altogether
* modify the blueprint_id argument description to include the AWS CLI command that can be used to get a list of IDs.
terraform-providers/terraform-provider-aws,terraform-providers/terraform-provider-aws,terraform-providers/terraform-provider-aws,terraform-providers/terraform-provider-aws