Create deploy-manage.adoc for Couchbase documentation

Added documentation for deploying and managing Couchbase, detailing its capabilities and deployment options.

Author: RichardSmedley

home/modules/ROOT/pages/deploy-manage.adoc

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+= Deploy and Manage Couchbase
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+include::partial$info-banner.adoc[]
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+= Deploy and Manage Couchbase 
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+The Developer Data Platform for Critical Applications in Our AI World.
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+Couchbase is a multipurpose NoSQL database for transactional, analytical, mobile, and AI applications.
+Our operational and analytical databases can be deployed self-managed or fully-managed as a service offering.
+Offline-first mobile takes Couchbase to the edge, and can be synced via App Services in the cloud, or a self-managed Sync Gateway deployment.
+AI Services (currently in private preview) simplify building agentic apps.
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