Promote/DO App Platform Deployment

[black-bryan]

Promotion of the scim-example for DigitalOcean App Platform using the DO portal or DO & 1Password CLI tools from the "Beta" examples directory.

This process of deployment has been used by many customers and since this is a quick and easy low cost SCIM bridge deployment, it is time to move these deployment options out of Beta. Link to DigitalOcean App Platform 1Password SCIM Bridge deployment using the DO portal Promoted DigitalOcean App Platform using the DO command line tool and the 1Password CLI from the beta directory Other changes:

• Introducing concept on main README.md and PREPARATION.md of Container-as-a-Service deployment, differentiating from Advanced and Marketplace deployments.
• Detailing on the PREPARATION.md, how DNS and certificate management are handled by the CaaS infrastructure automatically.

[black-bryan]

New PR from the work of PR280, as PR280 was not merging correctly.