Update docs for reworked overview page

[jhlodin]

https://cockroachlabs.atlassian.net/browse/DOC-14987

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Files changed:

• src/current/_data/redirects.yml
• src/current/_includes/cockroachcloud/request-units.md:
• src/current/cockroachcloud/plan-your-cluster-basic.md
• src/current/_includes/sidebar-data-cockroachcloud.json
• src/current/_includes/v23.1/sidebar-data/cloud-deployments.json
• src/current/_includes/v23.2/sidebar-data/cloud-deployments.json
• src/current/_includes/v24.1/sidebar-data/cloud-deployments.json
• src/current/_includes/v24.2/sidebar-data/cloud-deployments.json
• src/current/_includes/v24.3/sidebar-data/cloud-deployments.json
• src/current/_includes/v25.1/sidebar-data/cloud-deployments.json
• src/current/_includes/v25.2/sidebar-data/cloud-deployments.json
• src/current/_includes/v25.3/sidebar-data/cloud-deployments.json
• src/current/_includes/v25.4/sidebar-data/cloud-deployments.json
• src/current/_includes/v26.1/sidebar-data/cloud-deployments.json
• src/current/_includes/v26.2/sidebar-data/cloud-deployments.json
• src/current/cockroachcloud/advanced-cluster-management.md
• src/current/cockroachcloud/authorization.md
• src/current/cockroachcloud/basic-cluster-management.md
• src/current/cockroachcloud/change-plan-between-basic-and-standard.md
• src/current/cockroachcloud/cluster-management.md
• src/current/cockroachcloud/cluster-overview-page.md
• src/current/cockroachcloud/connect-to-a-basic-cluster.md
• src/current/cockroachcloud/connect-to-the-cockroachdb-cloud-mcp-server.md
• src/current/cockroachcloud/export-metrics-advanced.md
• src/current/cockroachcloud/export-metrics.md
• src/current/cockroachcloud/overview-page.md
• src/current/cockroachcloud/pci-dss.md
• src/current/cockroachcloud/physical-cluster-replication.md
• src/current/cockroachcloud/plan-your-cluster-basic.md
• src/current/cockroachcloud/production-checklist.md
• src/current/cockroachcloud/troubleshooting-page.md
• src/current/releases/cloud.md
• src/current/v25.1/monitor-and-analyze-transaction-contention.md
• src/current/v25.2/monitor-and-analyze-transaction-contention.md
• src/current/v25.3/monitor-and-analyze-transaction-contention.md
• src/current/v25.4/monitor-and-analyze-transaction-contention.md
• src/current/v26.1/monitor-and-analyze-transaction-contention.md
• src/current/v26.2/monitor-and-analyze-transaction-contention.md

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[amerani]

@jhlodin Could you please fix the build pipeline so we can see the rendered docs preview?

[bsanchez-the-roach]

Just a few tiny nits, otherwise LGTM, nice job.