Dark mode: Stickers

[julien-deramond]

This PR handles the dark mode for the Sticker component.

New CSS vars:

• --#{$prefix}sticker-color: #{$sticker-color};

New Sass vars:

• $sticker-color
• $sticker-background-color
• $sticker-font-weight

Live previews

• https://deploy-preview-2288--boosted.netlify.app/docs/5.3/dark-mode/#stickers
• https://deploy-preview-2288--boosted.netlify.app/docs/5.3/components/sticker
• https://deploy-preview-2288--boosted.netlify.app/docs/5.3/examples/stickers/

[netlify]

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