docs: fix links in mirrored README

[zakazaka95]

Summary

• replace five relative README links with stable repository URLs
• keep the links valid both on GitHub and when the README is mirrored into docs.genlayer.com

Why

The testing-suite README is also published at https://docs.genlayer.com/api-references/genlayer-test. Relative targets such as docs/direct-runner.md are resolved under the docs site and currently return 404. Absolute repository URLs work in both rendering contexts.

Validation

• verified every linked file or directory exists on the main branch
• documentation-only change; no package or runtime behavior changed

[coderabbitai]

Important

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⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Team

Run ID: ab33ba9a-f30a-4ae3-a88d-93ce54fe130e

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[github-actions]

This PR targeted main, which is only the default/static branch.

I retargeted it to v0.30-dev, the active development branch. Pushes to v0.30-dev automatically fast-forward main.