feat(video-description): deprecate video-description rule

[straker]

Per Wilco's suggestion in the linked issue, only 1 minor media player supports <track kind="description"...>.

Closes issue: #1712

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[jeeyyy]

This looks good, but according to this doc - https://github.com/dequelabs/axe-core/blob/develop/doc/backwards-compatibility-doc.md#table-summary-of-what-deque-guarantees-with-public-axe-core-api, need to keep some track of all the deprecated stuff so we know we do the right version bump when time comes to it.