use fixed tarifs and add additional costs

components/header.tsx

@@ -1,10 +1,6 @@
 import React from 'react'
 
-export default function Header({
-  label = 'Pfadi Bussle Buchen',
-}: {
-  label?: string
-}) {
+export default function Header({ label = 'Pfadi Bussle' }: { label?: string }) {
   return (
     <div className="flex flex-row items-center p-3 my-3 text-white bg-gray-600 rounded-sm">
       <h1 className="flex-grow text-3xl">{label}</h1>