Explain Transaction crates API + improve TypeScript SDK docs

Feedback:

- Suggested adding more natural language explanations for the Transaction crates API (e.g. what the transaction APIs actually do, not just the signatures).
- Documentation is still in progress, but more in-depth examples for the TypeScript SDK would help a lot.
- Suggested having all docs in one place (currently hopping repo to repo feels messy).

Ask:

- Add clearer, higher-level explanations + examples for the Transaction crates API.
- Expand TypeScript SDK docs with deeper examples.
- Consolidate docs into one central place for easier navigation.

Why:
Makes the dev experience smoother and reduces friction when learning the stack.

**This feedback came through DevRel applications.**

The issue is about improving documentation for the Transaction crates API and TypeScript SDK. First, locate the existing docs in the repository, likely in a `docs/` directory or within source code comments. Review the current Transaction API signatures and TypeScript SDK examples. The goal is to add higher-level explanations and more in-depth examples. Check if there are other repos mentioned for consolidation, and understand the structure to propose a unified doc location.

Escrito por el modelo de indexación a partir del texto del issue.