docs(firestore): add Firestore pipelines documentation

[mikehardy]

Description

Adds user-facing Firestore Pipelines documentation: overview page with Enterprise requirements, platform notes, upstream links, YouTube embed, and a findNearest vector search example using lowercase distanceMeasure values; SDK compatibility table vs firebase-js-sdk; sidebar entries under Cloud Firestore. Also fixes broken okf-bundle and /reference links in existing docs.

Related issues

• feat(firestore): variable() and arrayFilter() API features for pipelines #9017

Release Summary

Document Firestore Pipelines (@react-native-firebase/firestore/pipelines) for Enterprise users, including firebase-js-sdk parity notes and vector search guidance.

Checklist

• I read the Contributor Guide and followed the process outlined there for submitting PRs.
  • Yes
• My change supports the following platforms;
  • Android
  • iOS
  • Other (macOS, web)
• My change includes tests;
  • e2e tests added or updated in packages/**/e2e
  • jest tests added or updated in packages/**/__tests__
• I have updated TypeScript types that are affected by my change.
• This is a breaking change;
  • Yes
  • No

Test Plan

• yarn lint:js
• yarn lint:markdown
• yarn lint:spellcheck
• audit-docs.page mechanical audit (docs.page CLI, frontmatter, next/previous, Prettier) — all stages passed
• Visual review: https://rnfirebase.io/~pipeline-docs

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[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces documentation for the new Firestore Pipelines feature in React Native Firebase. It provides developers with guidance on Enterprise requirements, platform-specific notes, and usage examples for vector search. Additionally, it improves the documentation structure and resolves several broken links to ensure a better developer experience.

Highlights

• Firestore Pipelines Documentation: Added comprehensive documentation for Firestore Pipelines, including an overview, Enterprise requirements, and a vector search example.
• SDK Compatibility: Created a new SDK compatibility page to track parity between React Native Firebase and the firebase-js-sdk for pipeline operations.
• Navigation and Link Fixes: Updated documentation navigation to include the new pipeline sections and fixed broken links in existing documentation.

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[gemini-code-assist]

Code Review

This pull request introduces comprehensive documentation for the new Firestore pipeline queries feature in React Native Firebase, adding overview and SDK compatibility guides, updating navigation links, and fixing broken relative links in existing documentation. The review feedback identifies critical errors in the basic code example within the new pipelines documentation: the example incorrectly calls a non-existent .execute() method on the pipeline instance instead of using the standalone execute function, fails to import the execute function, and uses an incorrect option key (fields instead of selection) in the .select() stage.

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