DOCS-3845 Expo Crash Reporting and Error Tracking Documentation

[alai97]

What does this PR do?

Adds a doc page for Expo Crash Reporting and Error Tracking and a preview for https://github.com/DataDog/dd-sdk-reactnative/pull/233/.

Motivation

DOCS-3845

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.