How to replace Discourse <header> with my own?

[pfaffman (Jay Pfaffman)]

@paulmasri

Is there already a solution for this?

There are several. I think that a couple are available if you try to add a theme, but you can look here:

https://meta.discourse.org/search?context=topic&context_id=132740&q=%23theme%20header&skip_context=true