Redirect all old cloud links to new cloud docs

[stktung]

Cloud docs had a new revamp and pages were restructured.

This PR fixes a redirection issue reported by george here. As well as redirect all old cloud links to the new cloud docs.

Prior to the fix, these were the status of the links

pass   /cloud/
pass   /cloud/automation/
broken /cloud/automation/api.html
pass   /cloud/automation/pulumi.html
pass   /cloud/automation/terraform.html
pass   /cloud/faq.html
pass   /cloud/faq/
broken /cloud/faq/cluster-provisioning.html
broken /cloud/faq/cluster_provisioning.html
broken /cloud/faq/operational-characteristics.html
broken /cloud/faq/providers.html
broken /cloud/faq/roadmap.html
broken /cloud/faq/sla.html
broken /cloud/faq/support.html
broken /cloud/faq/troubleshooting.html
pass   /cloud/getting-started/
pass   /cloud/getting-started/private_access/
pass   /cloud/getting-started/private_access/aws.html
pass   /cloud/getting-started/private_access/azure.html
pass   /cloud/getting-started/private_access/gcp.html
pass   /cloud/getting-started/public.html
pass   /cloud/guides/
pass   /cloud/guides/kubernetes.html
pass   /cloud/guides/migration.html
pass   /cloud/guides/tailscale.html
pass   /cloud/integrations/
pass   /cloud/integrations/cloudwatch.html
broken /cloud/integrations/issues.html
broken /cloud/integrations/notifications.html
pass   /cloud/integrations/opsgenie.html
pass   /cloud/integrations/slack.html
broken /cloud/intro/
broken /cloud/intro/eventstore-cloud-status.html
broken /cloud/intro/preview.html
broken /cloud/intro/quick-start.html
pass   /cloud/introduction.html
pass   /cloud/networking/
pass   /cloud/networking/private-network.html
pass   /cloud/networking/public-network.html
pass   /cloud/ops/
pass   /cloud/ops/account-security.html
broken /cloud/ops/backup.html
pass   /cloud/ops/backups.html
broken /cloud/ops/disk_expand.html
pass   /cloud/ops/events.html
pass   /cloud/ops/jobs.html
broken /cloud/ops/manual_backups.html
broken /cloud/ops/restore.html
broken /cloud/ops/scheduled_backups.html
pass   /cloud/ops/sizing.html
broken /cloud/provision/
broken /cloud/provision/aws.html
broken /cloud/provision/aws/
broken /cloud/provision/azure.html
broken /cloud/provision/azure/
broken /cloud/provision/azure/considerations.html
broken /cloud/provision/cloud-instance-guidance/
broken /cloud/provision/gcp.html
broken /cloud/provision/gcp/
broken /cloud/provision/sizing.html
broken /cloud/use/
broken /cloud/use/kubernetes.html
broken /cloud/use/kubernetes/aks.html
broken /cloud/use/kubernetes/eks.html
broken /cloud/use/kubernetes/gke.html
broken /cloud/use/migration.html
broken /cloud/use/migration/replicator.html
broken /cloud/use/tailscale.html

[cloudflare-workers-and-pages]

Deploying documentation with    Cloudflare Pages

Latest commit:	1e07043
Status:	✅  Deploy successful!
Preview URL:	https://73643a76.documentation-21k.pages.dev
Branch Preview URL:	https://fix-cloud-html-redirect-issu.documentation-21k.pages.dev

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[stktung]

cc'ing @George-Payne and @dgivens for visibility.

[coloradomorrissey]

@stktung @George-Payne @dgivens @cchanning before I do anything with this, would someone confirm the PR that Chris is putting through doesn't blow up the redirects: #781