I do the same, but after a while I got fed up with the tedium of hand-managing the metadata and all the duplication that happens if you add OpenGraph, Twitter a

I do the same, but after a while I got fed up with the tedium of hand-managing the metadata and all the duplication that happens if you add OpenGraph, Twitter and Dublin Core. So I wound up storing the basic metadata in a JSON file, then I assemble the header and footer of the page with PHP, which is then rendered out to a complete HTML page. It's not quite a SSG, but just a little help automating the boring stuff.