Temporarily remove failing ray tutorial

[uri-granta]

Related issue(s)/PRs: #848

Summary

The ray tutorial is currently failing to build. Temporarily remove it so we can release.

Fully backwards compatible: yes

PR checklist

• [ ] The quality checks are all passing
• [ ] The bug case / new feature is covered by tests
• [ ] Any new features are well-documented (in docstrings or notebooks)