FIX: trailing slashes

Fix trailing slashes for links

app/utils/navigation.ts

@@ -1,24 +1,24 @@
 export const navigation = [
   {
-    to: `/booking`,
+    to: `/booking/`,
     label: 'Projektbuchung',
     icon: 'ph:calendar-check-duotone',
     aria: 'Link dieser Seite: Preise'
   },
   {
-    to: `/flatrate`,
+    to: `/flatrate/`,
     label: 'Flatrate',
     icon: 'ph:piggy-bank-duotone',
     aria: 'Link dieser Seite: Preise'
   },
   {
-    to: `/references`,
+    to: `/references/`,
     label: 'Referenzen',
     icon: 'ph:sparkle-duotone',
     aria: 'Link dieser Seite: Referenzen'
   },
   {
-    to: `/contact`,
+    to: `/contact/`,
     label: 'Kontakt',
     icon: 'ph:chats-circle-duotone',
     aria: 'Link dieser Seite: Kontakt'