DOCSP-47132: Add new page for Data API alternative

[cbullinger]

Pull Request Info

Jira ticket: https://jira.mongodb.org/browse/DOCSP-47132

Added new page for Data API alternative. Add link to new page on existing Data API Deprecation page

Staging Links

data-api/migration/data-api-tutorial

data-api/data-api-deprecation

sync/migration/reactnativetutorial

Reminder Checklist

Before merging your PR, make sure to check a few things.

• Did you tag pages appropriately?
  • genre
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• Describe your PR's changes in the Release Notes section
• Create a Jira ticket for related docs-realm work, if any

Release Notes

Review Guidelines

REVIEWING.md

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[MongoCaleb]

small nits only