Celebrate the little things; big web perf win for lazy Yari images

[peterbe]

tl;dr:

• All the redirects are gone!
• 91KB instead of 262KB of less transferred binary image payload
• Now all the live samples depend on a "local data" making it perfectly possible to render this page offline
• Bonus; Yari actually CI checks every single image so corrupt or orphaned images can not exist anymore.

Open https://developer.mozilla.org/en-US/docs/Web/API/Canvas_API/Tutorial/Applying_styles_and_colors with the Network panel and you'll see:

Soon, all the live samples' images will be local to the content. I.e. instead of https://mdn.mozillademos.org/files/1234/Canvas-rgba.png it's now just ./canvas-rgba.png.
It's being done in mdn/content#6025
But you can test it on: https://pr6025.content.dev.mdn.mozit.cloud/en-US/docs/Web/API/Canvas_API/Tutorial/Applying_styles_and_colors

Instead, this is what you see: