PS-11244 [DOCS] Update the Percona Live banner (#727)

Update main.html

Author: alina-derkach-oaza

_resourcepdf/overrides/main.html

@@ -7,13 +7,13 @@
   {% extends "base.html" %}
 
   {% block announce %}
-  <div class="md-banner" style="text-align: center;">
-    Where the open source database community meets:
-    Use code <strong>PERCONA75</strong> and secure your spot for Percona Live.
+<div class="md-banner" style="text-align: center;">
+  Where the open source database community meets:
+  Secure your spot for Percona Live.
 
-    <a
-      class="breakdance-link button-atom button-atom--primary bde-button__button"
-      href="https://perconalive.com/2026-usa/"
+  <a
+    class="breakdance-link button-atom button-atom--primary bde-button__button"
+    href="https://perconalive.com/2026-amsterdam/registration/"
       target="_blank"
       data-type="url"
       style="