I can recommend Kirby (https://getkirby.com/ https://getkirby.com/), a flat file PHP CMS. It’s fast, has a panel to update data and can be hosted on any basical

I can recommend Kirby (https://getkirby.com/ https://getkirby.com/), a flat file PHP CMS. It’s fast, has a panel to update data and can be hosted on any basically any PHP host. Just use the quite simple PHP-templates and add CSS & JS like you already know how to do. No need to complicate things.