docs(neo4j): add guides and examples

[tamalsaha]

Summary

• expand Neo4j guides to match the detailed style used in Postgres docs

• replace brief/stub content with full step-by-step operational walkthroughs

• update Neo4j concept and overview pages to accurately describe day-2 workflows and autoscaling behavior

• Updated example manifests to use latest active catalog version (2025.12.1).

What Was Updated

• operation guides expanded with detailed flow and verification:
  • UpdateVersion
  • Restart
  • VolumeExpansion
  • Reconfigure
  • ReconfigureTLS
  • RotateAuth
  • HorizontalScaling
  • VerticalScaling
• monitoring guides expanded:
  • Builtin Prometheus
  • Prometheus Operator
• autoscaler guides expanded:
  • Compute autoscaling
  • Storage autoscaling
• core docs expanded:
  • quickstart
  • RBAC
  • private registry usage
  • custom RBAC usage
  • configuration via config file
• concepts updated:
  • Neo4j
  • Neo4jVersion catalog
  • Neo4jOpsRequest
  • Neo4jAutoscaler
• overview pages updated across Neo4j guide sections (including backup, ops-request, monitoring, tls, reconfigure, scaling, update-version, rotate-auth, autoscaler)

Notes

• changes are documentation-focused and intended to make Neo4j docs consistent with existing KubeDB guide depth and structure
• PR remains scoped to Neo4j documentation and related guide index updates

[github-actions]

Visit the preview URL for this PR (updated for commit 4d0c397):

https://kubedb-v2-hugo--pr864-pr-neo4j-docs-6yceu058.web.app

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