remover booker, that's overdosed

It also brings the problem of consolidating bookers over multiple
bookings. The amount of data is not justifying having it in an own
entity

pages/admin/booking/[uuid]/bill.tsx

@@ -158,7 +158,7 @@ export default function BookingBillPage({
               {daysFormatFrontend(booking.days)}
             </div>
             <div>
-              <strong>Bucher:</strong> {booking.booker.name}
+              <strong>Bucher:</strong> {booking.name}
             </div>
             <div>
               <strong>Buchungsstatus:</strong>{' '}

pages/admin/booking/[uuid]/index.tsx

@@ -74,7 +74,7 @@ export default function ShowBookingAdmin({
           <strong>Buchungszeitraum:</strong> {daysFormatFrontend(booking.days)}
         </div>
         <div>
-          <strong>Bucher:</strong> {booking.booker.name}
+          <strong>Bucher:</strong> {booking.name}
         </div>
         <div>
           <strong>Buchungsstatus:</strong> {getBookingStatus(booking.status)}

pages/admin/index.tsx

@@ -59,13 +59,13 @@ export default function AdminRecentBookings({ bookings }) {
                 <div className="bg-white px-2 py-3 sm:grid sm:grid-cols-3 sm:gap-4 sm:px-6">
                   <dt className="text-sm font-medium text-gray-500">Bucher</dt>
                   <dd className="mt-1 text-sm text-gray-900 sm:mt-0 sm:col-span-2">
-                    {booking.booker.name}
+                    {booking.name}
                   </dd>
                 </div>
                 <div className="bg-gray-100 px-2 py-3 sm:grid sm:grid-cols-3 sm:gap-4 sm:px-6">
                   <dt className="text-sm font-medium text-gray-500">Email</dt>
                   <dd className="mt-1 text-sm text-gray-900 sm:mt-0 sm:col-span-2">
-                    {booking.booker.email}
+                    {booking.email}
                   </dd>
                 </div>
                 <div className="bg-white px-2 py-3 sm:grid sm:grid-cols-3 sm:gap-4 sm:px-6">