Policy/linting for {% Video %} tag embeds?

The `{% Video %}` embed being added to a docs page at https://github.com/GoogleChrome/developer.chrome.com/pull/2143 seems like it could lead to a bad experience for users:

- We allow an embedder to set `autoplay` regardless of the size of the underlying video. The video itself is 17.2mb, which is much smaller than an animated GIF would be, but still a much larger download that you'd expect when you visit a docs page. I believe our media uploader supports files up to 25mb.
- We don't do anything that I can see to respect [`prefers-reduced-motion`](https://developer.mozilla.org/en-US/docs/Web/CSS/@media/prefers-reduced-motion) or [`prefers-reduced-data`](https://developer.mozilla.org/en-US/docs/Web/CSS/@media/prefers-reduced-data).

Some of these might be addressable via code changes, and some might be addressable via linting rules (i.e. only allow autoplay when the video is is smaller than some threshold).