Review: Rule template

Hi all,
Github is having some issues at the moment, so I just wanted to pass this
to you for review for tomorrow's call:
https://github.com/WilcoFiers/auto-wcag/commit/934edd172b416367584008ff4ee5af09d058bed1

It's an updated version of the rule format. Let me know what you think!

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*Wilco Fiers* - Senior Accessibility Engineer