[4.7.0] Document Platform Gateway registration and deployment

[YasasRangika]

Description

• Renamed the page to Gateway Registration and Deployment (gateway-registration-and-deployment.md).
• Added an Overview section explaining the two registration modes: Admin Portal (manual) and Automated Gateway Registration (declarative via deployment.toml).
• Create a Platform Gateway in the Admin Portal is now a brief pointer to the existing walkthrough in Getting Started (#create-a-platform-gateway-in-the-admin-portal), instead of duplicating it.

Comment addressed: #11780 (comment)

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