Fix: Clariy Ray Documentation and Fix Minor Issues

[garylvov]

Description

This PR cleans up the Ray documentation to be more clear, and fixes some small issues in the code.

• Moved local set up to be an easier Docker-based thing
• Added Wget to docker container to fix issue where Ray head would fail health check on GKE where the workers wouldn't start
• Removed redundant information from Documentation
• Added a local quickstart
• (investigated whether https mlflow was possible, added flag to jinja env)@kellyguo11

Type of change

• Bug fix (non-breaking change which fixes an issue)
• This change requires a documentation update

Checklist

• I have run the pre-commit checks with ./isaaclab.sh --format
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• I have updated the changelog and the corresponding version in the extension's config/extension.toml file
• I have added my name to the CONTRIBUTORS.md or my name already exists there