I’m currently using the “multi-lang skeleton” (which means, the cacti template with the lang-switcher plugin). I’d like to add a modular page as the home-page. Would I do this by installing the “antimatter” theme in the themes folder? (I’m a hobby developer and have never touched terminal, by the way).
Yes, you can install and use as many themes on different pages as you’d like with the Themer-plugin.