Sales Enablement revamp per feedback

[KateYoak]

What does this PR do?

Revamp sales-enablement page based on peer feedback. Ready for next round of reviews.

Motivation

Team feedback

Preview

https://docs-staging.datadoghq.com/KateYoak/sales-enablement-3/partners/sales-enablement

Additional Notes

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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

Removed or renamed files (these should redirect)

Renamed files

Modified Files

• https://docs-staging.datadoghq.com/KateYoak/sales-enablement-3/partners/sales-enablement