chore: remove circuits from repo

[cedoor]

Description

Circuits have been moved to the zk-kit.circom and zk-kit.noir repositories to better organize the code. Thus, they will be removed from the main zk-kit repo.

Related Issue(s)

Re #282

Checklist

• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my code
• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation
• [x] My changes generate no new warnings
• [x] 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
• [ ] Any dependent changes have been merged and published in downstream modules

[0xjei]

hello @cedoor - will review this afternoon!