Update sBTC Documentation

[andrerserrano]

This milestone focuses on delivering comprehensive documentation for the sBTC protocol, with a particular emphasis on ensuring that signers, developers, and users have the resources they need to successfully interact with and understand the system.

1) Signer documentation includes:
Detailed step-by-step guides, API references, and architectural diagrams explaining how signers operate within the sBTC protocol. This includes:

• Overview of the signer's responsibilities and roles in securing the protocol
• Setup and onboarding procedures for new signers
• Explanation of the signer architecture and security best practices
• Detailed troubleshooting section for resolving common issues.

2) Developer-Focused Documentation:
A technical manual aimed at developers who want to interact with the sBTC protocol or contribute to its growth. This includes:

• API documentation for integration with the sBTC protocol.
• Code examples and use cases for interacting with the smart contracts.