Revamp and Expand Pathfinder Documentation

[TropicolX]

This PR introduces a thorough overhaul of the Pathfinder documentation using Docusaurus.

Live demo

Key highlights include:

1. Introduction & Getting Started

   • Clear guidance on hardware requirements, Docker usage, and building from source.
   • Detailed instructions for verifying a node is properly configured and running.

2. Interfacing with Pathfinder

   • Updated examples for JSON-RPC and WebSocket endpoints.

3. Database Snapshots

   • Streamlined steps for using Rclone or HTTPS to download snapshots.
   • Verification steps for checksums and recommendations for snapshot usage.

4. Monitoring API

   • Explanation of /health, /ready, and /ready/synced endpoints, plus /metrics for Prometheus integration.

5. FAQ Section

   • Frequently asked questions about upgrades, network switching, and security considerations.

6. Configuration Updates

   • Clarification of valid --network values (mainnet, sepolia-testnet, sepolia-integration, custom).
   • Examples for mixing command-line arguments and environment variables, highlighting PATHFINDER_ prefixed variables.
   • Logging and state trie pruning (archive vs k) explained with Docker and source-based setups.

Why This is Needed

• Provides a single, comprehensive resource for both new and experienced users of Pathfinder.
• Aligns documentation with the latest codebase defaults and newly added features.
• Reduces confusion and GitHub Issues related to misconfiguration or incomplete instructions.
• Docusaurus structure improves navigation and future maintainability.

Scope of Impact

• Changes affect only documentation files within the Docusaurus configuration and content directories.
• No breaking changes to the codebase itself.

Please let me know if you have any further suggestions or if additional changes are necessary.
Thank you for reviewing this PR!