Bump app/themes/hugo-theme-relearn from `827d2fd` to `609539c`

[dependabot[bot]]

Bumps app/themes/hugo-theme-relearn from 827d2fd to 609539c.

Commits

• 609539c highlight: fix codefence syntax in Hugo >= 0.121.0 #749
• e08d5a5 docs: wording
• df6df4c variant: missing hugo version update #679
• c2054f2 topbar: a11y #739
• 4d02514 docs: fix image link #747
• 8b96317 image: get resource images if link is prefixed with ./ #747
• e95386a theme: remove FF compat warnings
• 3b587c5 topbar: delete test code #739
• 11a1359 topbar: allow text for button 739
• d07497d variant: restore storage of nested variants #679
• Additional commits viewable in compare view

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[dependabot[bot]]

Superseded by #341.