Clarify archetype property: `level` or `difficulty`

[miacycle]

Current Behavior

Courses and Certifications differ in their name for this same property. Can we be consistent? Is one of these a bug?

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[leecalcote]

@aabidsofi19 which is which?

[aabidsofi19]

@leecalcote there is only level . difficulty is not valid property

[leecalcote]

Thanks for confirming. Please correct this bug in that case.

[aabidsofi19]

updated 👍