AV-82442: update copy for free tier

Author: osfameron

src/partials/header-content.hbs

@@ -70,7 +70,7 @@
                   <i class="far fa-arrow-to-bottom fa-fw"></i>
                 </a>
                 <a href="https://cloud.couchbase.com/sign-up" class="btn btn-primary" onclick="(window.dataLayer=window.dataLayer||[]).push({'event':'customEvent', 'category':'CTA', 'action':'Button Click',  'label':'Free Trial'});" >
-                  Start Free Trial
+                  Try Free
                   <i class="far fa-cloud fa-fw"></i>
                 </a>
               </div>