v2.54.1: More Accessibility Fixes, Convert Mixins

What's Changed

• feat: mixins for .align-* classes by @wesleyboar in #607
• build(deps): bump picomatch from 2.3.1 to 2.3.2 by @dependabot[bot] in #611
• refactor: convert x-figure & x-blockquote to mixins by @wesleyboar in #612
• fix: figure caption text illegible on dark section by @wesleyboar in #613
• fix: restore --global-color-primary--xx-dark #222222 by @wesleyboar in #614
• feat: release-publish script did not handle rc tag by @wesleyboar in #617
• fix: focus hidden for c-feed-list "read more" link by @wesleyboar in #609

Full Changelog: v2.54.0...v2.54.1