feat: Deprecate audio-caption rule

[WilcoFiers]

Disabling / deprecating this rule. Audio captions do not work (https://www.iandevlin.com/blog/2015/12/html5/webvtt-and-audio/), and there are other ways to make audio accessible.

Closes #997.

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• Follows the commit message policy, appropriate for next version
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• Code is reviewed for security by: Jey (@JKODU)

[jeeyyy]

The problem with axe-codeowners is that, when someone outside of the team approves you do not pass the waiting on code review check. The status still remains as review required.

[dylanb]

How does someone determine a rule that is deprecated?

[WilcoFiers]

@dylanb There's a ticket open #1062 to figure out how to notify users of deprecated stuff in axe-core.