Does it need to be in the title (as in html head title)?
If not, you can style your first h1 however you want via regular markdown and just coincidentally set the header title to the same unstylized title
You can find the whole source code here. I’m migrating from Pelican to Zola to reduce the generation time, but some things that I need are missing and I don’t know how to program plugins for Zola in Rust. I think the documentation should have a section explaining how to extend Zola with custom plugins.