Write tutorial/FAQ for metrics dashboard

[CarsonCook]

Is your feature request related to a problem? Please describe. The metrics dashboard is a new feature that users will need direction on how to use.

Describe the solution you'd like A docs-site documentation is contributed and linked in the service page. A Tour (embedded in the dashboard) is developed.

Describe alternatives you've considered Rely strictly on docs.zowe.org documentation, but this will lead to user pain points accessing this information

Additional context Part of the UX proposal MVP