Embedding repository videos in README.md markdown

[abitrolly]

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GitHub renders videos if they are attached to comments as described in https://github.blog/2021-05-13-video-uploads-available-github/ but doesn't render videos that are committed into repository.

At the same time GitHub renders .gifs committed into repository just fine. https://github.com/GoogleContainerTools/kaniko/tree/v1.12.1#demo but such .gifs take 8.5x more space than AV1 .webm videos.

    -rw-r--r--.  1 anatoli anatoli 3641232 Jul 21 20:29 demo.gif
    -rw-r--r--.  1 anatoli anatoli  420594 Jul 22 03:54 demo.webm

See abitrolly/kaniko@e8cbeee?diff=split

The referenced ![Demo](/docs/demo.webm) just links to raw blob page where the video can only be downloaded, but not played like the .gif.

I've just spent a day encoding that .gif demo into the most concise format just to find out that it can not be embedded. It would be nice if GitHub could turn on .webm rendering the same way.