Expand Documentation on Use of (optional) `tenant` Label

[korenyoni]

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Describe the Feature

The README currently does not explain the optional tenant label and how stacks.name_pattern can be configured to either use it or not use it.

Expected Behavior

The README should clearly and concisely explain how to configure atmos to use the optional tenant label, and how to write create the stack YAML configs accordingly.

Use Case

Users attempting to use atmos.yaml in its default form will be forced to use the tenant label, and no documentation indicates that this is an optional label and how to configure atmos to not use this label.

Describe Ideal Solution

Expand the documentation as described in Expected Behaviour.

Alternatives Considered

N/A

Additional Context

https://sweetops.slack.com/archives/CQCDCLA1M/p1643728355414279

[osterman]

We should overhaul https://atmos.tools/cli/configuration and improve the documentation of all fields.