[Sync to prerelease] Add dark-mode images for figures and markdown-basics docs - #2130
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Figures and Markdown Basics currently ship light-only elephant screenshots, which look jarring against a dark background for readers using the site's dark theme. Revives #1641, dropping its vendored pandoc-ext/list-table Lua filter in favor of the native list-table syntax Quarto 1.9 shipped after that PR went stale. Also wires up layout-attrib-negative-dark.png, which the original PR added but never referenced. (cherry picked from commit c736ea0)
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Description
Sync of #2120 to
prerelease.Original PR
Add dark-mode images for figures and markdown-basics docs
Figures and Markdown Basics ship light-only elephant screenshots, which look jarring against a dark background when readers toggle the site's dark theme.
Documents can now show a dark-mode variant for each image, using the existing
.light-content/.dark-contentconvention already used elsewhere on the site.Supersedes #1641, which added these dark assets back in April 2025 but went stale. That PR vendored a
pandoc-ext/list-tableLua filter to mix code blocks and images in table cells; this rewrites that markup using the list-table syntax Quarto 1.9 shipped natively, so no extension is needed.Also wires up
layout-attrib-negative-dark.png, an asset #1641 added but never referenced.