Comment by Brajeshwar

If you OK using a tiny tad JavaScript, it should be able to re-write that portion of the DOM to have HEADER and FOOTER common. Nonetheless, if you are also OK using Github, it has built-in setup where you blog in Plain-text (MarkDown) and things just works. You don't even need to build it on your local machine.

I wrote about it when I moved from WordPress to Jekyll. https://brajeshwar.com/2021/brajeshwar.com-2021/