Building the HTML of websites from templates and data at build time, so the server only serves finished files. Here extended to several domains from one source.
Project requirement
Keep several small websites with a shared look on shared Apache hosting, without a server-side runtime.
Technical question
How can shared parts live in one place while each site can still override them, and links between the sites keep working locally and online?
Validation
Three sample sites build from one source with shared and per-site layers; tests cover links, assets, overrides and the generated files.
Decision
A small Python and Jinja2 build with a shared layer, per-site overrides on the same path, and generated server configuration.
Generated per site: sitemap.xml, robots.txt, llms.txt and an Apache .htaccess with https redirects, old-URL redirects, HSTS and cache headers.
HSTS starts with a short max-age and is raised only after https has been stable, because it is hard to undo.
A Python build reads the sites from TOML, renders Jinja2 templates per domain and syncs the result into one output folder per site.