[DOCS-3636] Add Integrate Vector with Datadog

[maycmlee]

What does this PR do?

• Adds new doc
• Adds to nav
• Redirects "Aggregating Multiple Agents Using Vector" doc to this new one.

Motivation

DOCS-3636

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Reviewer checklist

• [ ] Review the changed files.
• [ ] Review the URLs listed in the Preview section.
• [ ] Check images for PII
• [ ] Review any mentions of "Contact Datadog support" for internal support documentation.

[github-actions[bot]]

Preview links (active after the build_preview check completes)

New or renamed files

• https://docs-staging.datadoghq.com/may/integration-vector-datadog/integrations/observability_pipelines/integrate_vector_with_datadog

Removed or renamed files (these should redirect)

• https://docs-staging.datadoghq.com/may/integration-vector-datadog/agent/vector_aggregation

Modified Files

• https://docs-staging.datadoghq.com/may/integration-vector-datadog/agent/
• https://docs-staging.datadoghq.com/may/integration-vector-datadog/database_monitoring/architecture
• https://docs-staging.datadoghq.com/may/integration-vector-datadog/infrastructure/cloud_cost_management
• https://docs-staging.datadoghq.com/may/integration-vector-datadog/integrations/guide/aws-integration-troubleshooting
• https://docs-staging.datadoghq.com/may/integration-vector-datadog/integrations/observability_pipelines/
• https://docs-staging.datadoghq.com/may/integration-vector-datadog/integrations/observability_pipelines/guide/custom-metrics-governance-drop-metrics-missing-specific-tags
• https://docs-staging.datadoghq.com/may/integration-vector-datadog/integrations/observability_pipelines/integrations
• https://docs-staging.datadoghq.com/may/integration-vector-datadog/integrations/observability_pipelines/setup
• https://docs-staging.datadoghq.com/may/integration-vector-datadog/integrations/observability_pipelines/vector_configurations
• https://docs-staging.datadoghq.com/may/integration-vector-datadog/integrations/observability_pipelines/working_with_data
• https://docs-staging.datadoghq.com/may/integration-vector-datadog/monitors/create/types/metric
• https://docs-staging.datadoghq.com/may/integration-vector-datadog/monitors/manage/
• https://docs-staging.datadoghq.com/may/integration-vector-datadog/partners/sales-enablement
• https://docs-staging.datadoghq.com/may/integration-vector-datadog/real_user_monitoring/browser/monitoring_page_performance
• https://docs-staging.datadoghq.com/may/integration-vector-datadog/synthetics/cicd_integrations/gitlab
• https://docs-staging.datadoghq.com/may/integration-vector-datadog/tracing/trace_collection/dd_libraries/nodejs
• https://docs-staging.datadoghq.com/may/integration-vector-datadog/tracing/trace_collection/library_config/go

[maycmlee]

Is there a way to delineate sections more clearly? There's a lot of sections to this and the page looks pretty dense. It'd be great to have more space or maybe even a line whenever there is a Header 2

Copy-wise, looks good to me! I'll likely come back with a small section to add around schemas in a couples days

Thanks for the feedback @barieom! Hm, so the spacing is automatically done. I can ask the team about line for each H2 sections, but it's not something we usually do. I did reformat the page a bit by taking out the Prerequisite H2 and adding sub-headers to both breakup the info and also so users can link directly to the info. Does that help?

What do you think about moving the Sink configuration section to be after the Source configuration section and then having Add Vector-sepcific tag after Sink configuration? It seems like that might flow better in terms of setting up Vector.

[urseberry]

This link, which should redirect, gives me a 404. Can you check it? https://docs-staging.datadoghq.com/may/integration-vector-datadog/agent/vector_aggregation.

Edit: looks like the new file needs an alias to the old one.