feat: update Mermaid diagrams to follow theme preference (#576)

Tim van Wijk

20.22.2025 902d1bfcae166cf9b0350bb88810e3c0162430a3

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**/themes/
demo/
.hugo/*
!.hugo/version
.hugo_build.lock
/node_modules
exampleSite/public/
.DS_Store
public/