[Doc] Update Rover 0.6 doc

[wu-sheng]

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• I had searched in the issues and found no similar feature requirement.

Description

Rover has removed the VM support and forces on the k8s only monitoring and profiling since 0.6

We should update the docs about this.

• Scope update. Update overview.md skywalking-rover#116
• Architecture graph and description, https://skywalking.apache.org/docs/skywalking-rover/next/en/concepts-and-designs/overview/. It should mention, we provide k8s env 7x24 monitoring.
• Example->Deploy on K8s should be replaced by deployment doc right after the Overview.

• Merge the docs of Module based, but redesign them from use case perspective. Such as
  • Common. (Logger + Core)
  • Service Discovery. Keep k8s relative only. Many others should have been expired. Need update.
  • Traffic. ALS Module
  • Profiling
    The key point of this change is, we don't mention module concept anymore. It is a dev concept, not a user's interest.

Use case

No response

Related issues

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Are you willing to submit a pull request to implement this on your own?

• Yes I am willing to submit a pull request on my own!

Code of Conduct

• I agree to follow this project's Code of Conduct

[wu-sheng]

Rover docs should be updated and released 0.6 in this month before backend v10.