docs: replace broken github pages links with docs.rs urls

[0x471]

Description

This PR replaces broken GitHub Pages documentation links with their docs.rs equivalents

Related Issue(s)

Closes #82

Checklist

• I have read and understand the contributor guidelines and code of conduct.
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• I have run yarn style without getting any errors
• 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

[0x471]

The repo link gives 404 as well: https://privacy-scaling-explorations.github.io/zk-kit.rust/

[vplasencia]

Thank you very much @0x471! ✨

[vplasencia]

The repo link gives 404 as well: https://privacy-scaling-explorations.github.io/zk-kit.rust/

Thanks! Fixed!