Add honeypot, spam protection to contact form

src/lib/components/BookingSection.test.ts

@@ -101,8 +101,10 @@ describe('BookingSection', () => {
       location: 'Kingsland',
       message: 'Loves small group walks.',
       services: ['Pack Walks', 'Other Services'],
+      website: '',
       referrer: 'https://www.google.com/'
     });
+    expect(payload.formStartedAt).toEqual(expect.any(Number));
 
     expect(screen.getByRole('dialog', { name: /Booking confirmed/i })).toBeInTheDocument();
     expect(screen.getByRole('heading', { name: /on our radar/i })).toBeInTheDocument();