update RBAC customizations and sub-project info

[JimBugwadia]

Related issue

Fixes https://github.com/kyverno/website/issues/1311

Proposed Changes

Update RBAC customizations, quick start, and sub-project info.

Related feature: https://github.com/kyverno/kyverno/issues/5690 and PR: https://github.com/kyverno/kyverno/pull/10785.

Checklist

• [x] I have read the contributing guidelines.
• [x] I have inspected the website preview for accuracy.
• [x] I have signed off my issue.