Bump app/themes/hugo-theme-relearn from `827d2fd` to `b19ca89`

[dependabot[bot]]

Bumps app/themes/hugo-theme-relearn from 827d2fd to b19ca89.

Commits

• b19ca89 a11y: show tab focus on images #730
• 0d51f64 theme: remove code for older hugo versions #679
• f9887d1 docs: reword #679
• 55d6b5d theme: require new hugo version for leveraging findRESubmatch #679
• 85a4f5e docs: mention fallback #722
• e4e5147 variant: allow @​import in own stylesheets #679
• 87df35a variant: add referenced but not configured variants #679
• 1119b3f variant: cache variant config #679
• ff978f3 variant: don't allow auto mode variants to be downloaded #679
• 74a9c4d mermaid: make generator zoomable again #725
• Additional commits viewable in compare view

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[dependabot[bot]]

Superseded by #327.