[aarhus-2025]: Announce tickets (#14722)

Author: danquah

content/events/2025-aarhus/registration.md

@@ -32,7 +32,7 @@ Description = "devopsdays Aarhus 2025"
       throughout the conference. What's not to love?
     </p>
     <h3>Tickets</h3>
-    <p>Tickets will be available soon!</p>
+    <p><a href="https://devopsdaysdenmark.ticketbutler.io/e/devopsdays-aarhus-2025/">Registration is open</a></p>
     <div class="row">
       <div class="col-md-2">
         <strong>Dates</strong>

content/events/2025-aarhus/welcome.md

@@ -35,8 +35,8 @@ location_address: "" #Optional - use the street address of your venue. This will
 
 nav_elements: # List of pages you want to show up in the navigation of your page.
   # - name: propose
-  # - name: register
-  #   url: https://www.eventbrite.co.uk/e/devopsdays-aarhus-2022-tickets-92256964063?aff=ebdssbeac
+  - name: register
+    url: https://devopsdaysdenmark.ticketbutler.io/e/devopsdays-aarhus-2025/
   - name: location
   # - name: registration
   # - name: program