docs: add merkle tree-based revocation approaches article to revocation info

[vplasencia]

Description

This PR adds the Revocation in zkID: Merkle Tree-based Approaches article to the Revocation info.

Article link: https://pse.dev/blog/revocation-in-zkid-merkle-tree-based-approaches

Checklist

• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

Important

We do not accept pull requests for minor grammatical fixes (e.g., correcting typos, rewording sentences) or for fixing broken links, unless they significantly improve clarity or functionality. These contributions, while appreciated, are not a priority for merging. If you notice any of these issues, please create a GitHub Issue to report them so they can be properly tracked and addressed.

[Copilot]

Pull request overview

This PR updates a documentation link in the revocation resources section, replacing a HackMD draft link with the final published article on the PSE blog.

Changes:

• Updated the Merkle Tree-based Revocation Methods resource link from HackMD to the published PSE blog article

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.