doc(sdk): update getting started tutorial for mgmt track2 preview

[archerzz]

• clean up the styling and structure to be consistent with other docs of mgmt track2 preview
• replace examples with the ones from resource managers SDK and compute SDK respectively

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• Include updated management metadata.
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  Note: We have recently updated the PSH module called by generate.ps1 to emit additional data. This would help reduce/eliminate the Code Verification check error. Please run following command:

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[fengzhou-msft]

LGTM for the resource group samples.

[m-nash]

/check-enforcer evaluate

[m-nash]

/check-enforcer override