[draft] make embedded video in html cards work in email #1398
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Some Ghost users host videos externally (i.e. on AWS) and use the html card to paste in a video tag. Email clients generally show nothing, not even the poster.
This patch adjusts the write-out of the html card (only for email, not for web), identifying video tags with the poster attribute set, and replacing them with the poster image and a link to the published post.
I'm using cheerio for this proof of concept, but happy to swap it for something else. (It would be a new dependency for Koenig.)