Update MCAD/CodeFlare documentation to improve usability

[anishasthana]

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Description

The MCAD documentation for usage alongside KubeRay[1] is quite old and hard to follow. We should update this document to make it easier to follow and bring it up to date with the latest in the CodeFlare ecosystem.

[1] https://github.com/ray-project/kuberay/blob/master/docs/guidance/kuberay-with-MCAD.md

Use case

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Related issues

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Are you willing to submit a PR?

• Yes I am willing to submit a PR!

[anishasthana]

cc @kevin85421 can you assign this to me?

[tedhtchang]

@anishasthana Could you also take a look this comment to see if it can be addressed here.