Add Groningen city as area served. Serve promo folder with flyers

main.go

@@ -404,6 +404,10 @@ func (s *Server) setupRoutes() {
 	fs := http.FileServer(http.Dir("static/"))
 	http.Handle("/static/", http.StripPrefix("/static/", cacheControlMiddleware(fs)))
 
+	// Promo files under /promo served from static/promo/
+	promoFS := http.FileServer(http.Dir("static/promo/"))
+	http.Handle("/promo/", http.StripPrefix("/promo/", cacheControlMiddleware(promoFS)))
+
 	// Page routes
 	http.HandleFunc("/", s.homeHandler)
 	http.HandleFunc("/contact", s.contactHandler)