PORT-7641 Add a disk to the EC2 Instance

[phalbert]

Description

Added docs pages

Please also include the path for the added docs

• Add disk to EC2 (docs/create-self-service-experiences/setup-backend/gitlab-pipeline/examples/add-ec2-volume.md)

Updated docs pages

Please also include the path for the updated docs

• Create EC2 instance (docs/create-self-service-experiences/setup-backend/gitlab-pipeline/examples/create-ec2-instance.md)

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