[devtools] Add devTools-tip video for CSS Grid

[jecfish]

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site/en/docs/devtools/recorder/index.md

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[jeffposnick]

Sorry to detail this PR, but I'm curious whether there's been a discussion in place around tweaking our {% Video %} embed tag to prevent what might be a negative user experience.

Right now, with autoplay="true" set, visiting https://deploy-preview-2143--developer-chrome-com.netlify.app/docs/devtools/recorder/ will download the 17.2mb movie unconditionally, and it will start playing without user interaction. Also, note that you have muted="false" is set, but we force muted whenever autoplay is set, so there may be wasted bytes being transferred for an audio track that is never audible. (Unless the browser is smart enough not to download the audio track when muted is set?) In any case, it's good that it is muted, because I think many folks would be surprised to hear audio immediately after visiting a docs page.

I am new to d.c.c. and don't know the history behind the {% Video %} tag, so I'm going to move this discussion over to GoogleChrome/webdev-infra#24 to make it more formal. I don't want to stand in the way of this PR if it's important to get it merged, but I wanted to at least bring some visibility to the file size.

[jecfish]

Close this PR as it is a mistake. It's an stale branch, not CSS Grid changes. The video has already been removed months ago and replaced with a YouTube video. See https://developer.chrome.com/docs/devtools/recorder/.