Why use a static site generator when you can just... y'know... write the HTML yourself?
SSGs are amazing, if you want a full-fledged site. But if you just want to dumb copy/paste one file into another, they're so much overkill.
This repo simply looks for any {template_name.html} in the body of the pages/page_name.html, and replaces it with the content of partials/template_name.html, and writes it to public/page_name.html with that new content.
It also does a few other little things, like looking for {page} and replacing it with the page_name (for uses like class="home" and setting the <title>).
Nice and simple, who needs Gatsby.
Using TypeScript and ts-node, this script lives in ./scripts/generatePages.ts. Why TypeScript; because it's great, and it makes JavaScript fun again.
Run npm run build to execute this script, as well as copy over any assets required into the public/ directory.
The site is hosted on Firebase, and can be deployed by using firebase deploy. The CI pipeline uses firebase deploy --token tokenFromEnvVars.