website: Improve mermaid diagram dark mode

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#2,817 opened on Nov 18, 2025 0 comments 0 reactions 0 assignees View on GitHub

🤩 good-first-bug

Description

### Feature description

Can we style mermaid diagrams differently in dark mode? Probably!

First place to look, use of `[data-theme="dark"]` in css

### Motivating example

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