docs/website: Update support link for Styra (open-policy-agent#4479)

Signed-off-by: Torin Sandall <torinsandall@gmail.com>

docs/website/static/support.html

@@ -96,7 +96,7 @@
           </div>
 
           <div class="container support-list">
-            <div class="card" onclick="window.open('https://registration.styra.com/openpolicyagentsupport')">
+            <div class="card" onclick="window.open('https://www.styra.com/das-free?utm_medium=partner&utm_source=opa&utm_campaign=dmge&utm_content=opa-support')">
               <div class="card-body">
                 <div class="support-card-content d-flex flex-row align-items-center flex-wrap-sm">
                   <img class="card-img align-middle" src="./img/logos/styra-logo.png"/>