Add traits MVP docs

[alexvitkov]

Description

Problem*

Summary*

This PR adds docs for the Traits features implemented so far. It includes some basic examples for trait definitions, implementations, as well as trait bounds.

There will be more updates with post-MVP features as we implement them.

Traits roadmap in for traits is here: noir-lang/noir#2568

Additional Context

PR Checklist*

• I have tested the changes locally.
• I have formatted the changes with Prettier and/or cargo fmt on default settings.

[netlify]

✅ Deploy Preview for noir-docs ready!

Name	Link
🔨 Latest commit	1723cbc
🔍 Latest deploy log	https://app.netlify.com/sites/noir-docs/deploys/651e6d2fce1e250008be4210
😎 Deploy Preview	https://deploy-preview-395--noir-docs.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify site configuration.

[signorecello]

@alexvitkov maybe we should merge this when the feature is complete? can you keep updating this page with the latest and let me know when ready?

thanks for the amazing contributions!

[signorecello]

@alexvitkov I'm sorry I think you got caught in the middle of a migration of this repo to the Noir monorepo. Can you copy/paste this change into a new PR there and add the documentation flag?