Adds explicit-heading rule

[TylerJDev]

Adds explicit-heading rule. This rule disallows the following:

• Using Heading without providing a heading level via as, (e.g. <Heading>)
• Using as for any element that is not a heading (h1-h6)

Additional context: #57.

[changeset-bot]

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Latest commit: e1ea0b9

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