General MR

Summary

Consolidated Getting Started into one canonical newcomer journey:

Reworked the documentation landing page around user tasks instead of duplicating product marketing.
Rebuilt Getting Started around choosing an evaluation, customer-managed, disconnected, or upgrade path.
Moved the complete quickstart—without deleting its content—to Evaluation Quickstart.
Retained the former quickstart URL as a compatibility forwarding page.
Expanded First Customer-managed Deployment into a production-oriented checklist that delegates template-specific commands to the customer template.
Narrowed Installation to environment-specific deployment patterns.
Reordered navigation and corrected README entry points.
Fixed broken multiline quickstart.sh commands exposed during the move.

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