Mirror ADOPTERS item on documentation navbar

Author: Naros

_antora/supplemental_ui/partials/header-content.hbs

@@ -20,6 +20,7 @@
         <a class="navbar-item" href="{{siteRootUrl}}/documentation">DOCUMENTATION</a>
         <a class="navbar-item" href="{{siteRootUrl}}/releases">RELEASES</a>
         <a class="navbar-item" href="{{siteRootUrl}}/community">COMMUNITY</a>
+        <a class="navbar-item" href="{{siteRootUrl}}/community/users/">ADOPTERS</a>
         <a class="navbar-item" href="{{siteRootUrl}}/blog">BLOG</a>
       </div>
     </div>