Found it, sorry for the noise. Of course, it's all there:
https://github.com/jgm/pandoc-website

On Thursday, December 9, 2021 at 9:55:16 PM UTC+1 andreas....-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org 
wrote:

> I always wanted a template that produced such a nice layout. Is it 
> available for `pandoc -t html`?
>
>

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