Make customer ATOs less scary

[KKAtila]

Acceptance Criteria

Review and updates of the templates - streamline the ATU process leveraging and pulling in additional best practices

• [ ] https://github.com/cloud-gov/pages-core/issues/4564
• [x] Create a sample diagram for static website hosted on Pages

Annual assessment for the ATUed Sites

• [ ] Annual assessment requirements analysis
• [ ] Template(s) development