add notice to Ambassadors page (#1636)

Author: SethTisue

ambassadors/index.html

@@ -49,6 +49,9 @@ <h3 style="text-align: center;">Contacting Ambassadors</h3>
     </p>
     <br/>
     <h3 style="text-align: center;">Ambassadors</h3>
+    <p>
+      We are in the process of onboarding additional Ambassadors. Expect this list to grow considerably in the coming weeks and months. See our <a href="https://scala-lang.org/blog/2024/03/28/ambassadors-initiative.html">blog post</a> for more on this.
+    </p>
     <div class="ambassadors">
       {% for ambassador in site.data.ambassadors %}
         <div class="ambassador-item">