Add beta-service note to landing page

index.html

@@ -152,6 +152,14 @@
     line-height: 1.5;
   }
 
+  .beta-note {
+    margin-top: 24px;
+    font-size: 14px;
+    color: var(--muted);
+    max-width: 460px;
+    line-height: 1.5;
+  }
+
   .benefits {
     display: flex;
     gap: 20px;
@@ -272,11 +280,13 @@
   </div>
 
   <div class="cta-row">
-    <a class="cta" href="https://opencollective.com/inference-cooperative">Become a member</a>
+    <a class="cta" href="https://opencollective.com/inference-cooperative/donate?redirect=https://inference.coop/thanks/">Become a member</a>
     <a class="cta-secondary" href="https://my.inference.coop">Member login</a>
   </div>
 
-  <p class="how-it-works">How it works: join on Open Collective, then connect your account to get access to chat and member governance.</p>
+  <p class="how-it-works">How it works: join on Open Collective, then check your email to set up your account and get access to chat and member governance.</p>
+
+  <p class="beta-note"><strong>Beta:</strong> this service is a work in progress, being built by its members. Things may change as we learn.</p>
 
   <div class="benefits">
     <div class="benefit-card">