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Issue description

While the grading procedure evaluates the presence of the 'mode' setting in the ansible-navigator configuration file, there is no specification about it in the student guide.

Steps to reproduce:

Let the ansible-navigator.yml file have the following content (as per request):
```
—
ansible-navigator:
  ansible:
    inventory:
      entries:
        - inventory.yaml
  execution-environment:
    enabled: true
    image: hub.lab.example.com/ee-supported-rhel8:latest
    pull:
      policy: missing
  playbook-artifact:
    enable: false

```

Run `lab grade compreview-cr1`

You will see the following error: 

FAIL The ansible-navigator.yml file is configured correctly
  - The 'mode' setting is either not defined or commented out .......

Workaround:

There is no workaround: Adding a 'mode' directive does not silence the error message.

Expected result:

Grading shows PASS on the ansible-navigator configuration step.