docs: added yellowstone grpc

[dimitriedavid]

Description

This PR adds documentation for Yellowstone gRPC:

• Overview
• Quickstart
• API Reference
• Code examples
• Best practices

Changes Made

Added a new section for Yellowstone gRPC docs.

Testing

• [*] I have tested these changes locally
• [*] I have run the validation scripts (pnpm run validate)
• [*] I have checked that the documentation builds correctly

[github-actions]

🌿 Documentation Preview

Name	Status	Preview	Updated (UTC)
Alchemy Docs	✅ Ready	🔗 Visit Preview	Oct 13, 2025, 1:32 PM

[Copilot]

Pull Request Overview

This PR adds comprehensive documentation for Yellowstone gRPC, introducing a new section covering overview, quickstart guide, API reference, code examples, and best practices for streaming Solana blockchain data in real-time.

• Adds complete Yellowstone gRPC documentation section with overview, quickstart, API reference, examples, and best practices
• Creates navigation structure with Getting Started, API Reference, and Resources subsections
• Provides detailed documentation for all subscription types (accounts, transactions, slots, blocks) with filter options and response structures

Reviewed Changes

Copilot reviewed 10 out of 11 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
fern/docs.yml	Adds navigation structure for new Yellowstone gRPC documentation section
fern/api-reference/yellowstone/overview.mdx	Provides high-level overview of Yellowstone gRPC capabilities and Alchemy enhancements
fern/api-reference/yellowstone/quickstart.mdx	Contains getting started guide with authentication and basic connection examples
fern/api-reference/yellowstone/subscribe-request.mdx	Documents the core SubscribeRequest structure and configuration options
fern/api-reference/yellowstone/subscribe-*.mdx	Detailed API documentation for each subscription type (accounts, transactions, slots, blocks)
fern/api-reference/yellowstone/examples.mdx	Provides practical Rust code examples for common use cases
fern/api-reference/yellowstone/best-practices.mdx	Contains production best practices and architectural patterns

Comments suppressed due to low confidence (1)

fern/api-reference/yellowstone/subscribe-request.mdx:1

• There are multiple TODO comments for Rust examples. These should be completed or removed to avoid confusion in the documentation.

---

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}

[Copilot]

Pull Request Overview

Copilot reviewed 10 out of 11 changed files in this pull request and generated 3 comments.

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}

[AlvaroLuken]

Looks fantastic. 👏 Approved but please look at single linter error before merging!