Style GitHub videos

[hirasso]

Preview: https://deploy-preview-134--splendorous-kataifi-9ae281.netlify.app/announcements/swup-4/#fragment-plugin

Description

New styles and markdown rules:

• [data-video] converts the content to a video tag
• [data-screencast] styles the video as a browser window

<div data-video data-screencast>

https://path-to-video.mp4

</div>

Drive-By: Moved the parsing job to an Eleventy transform

Checks

• [x] The PR is submitted to the master branch
• [x] The code was linted before pushing (npm run lint)

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[daun]

😍

[hirasso]

sorry, again