Add embed type to Contentful to allow <script>

[stichbury]

Probably one for @tynandebold

I've made some screen recordings with Asciinema but I'm having trouble using them in the blog. (I have solved for now using a long-winded process that puts them up as unlisted youtube videos but I'd rather avoid this).

There are two options for the asciinema videos -- either convert to GIF (which is failing at present on the blog) or host on their site and include using <script> tags. See their (excellent) docs for details.

I don't think we can embed a content type that uses <script> and have it render the video, on the blog, right?

What would be needed and would it be possible to put this as a request on the backlog please?