Add quarkus hub menu

Author: holly-cummins

src/partials/header-content.hbs

@@ -31,11 +31,14 @@
         <div class="navbar-item has-dropdown is-hoverable">
           <div class="navbar-link">Extensions</div>
             <div class="navbar-dropdown">
-            <a class="navbar-item" href="http://quarkus.io/extensions">Browse Extensions</a>
-                <a class="navbar-item" href="http://quarkus.io/faq/#what-is-a-quarkus-extension">Use Extensions</a>
-                <a class="navbar-item" href="http://quarkus.io/guides/writing-extensions">
+            <a class="navbar-item" href="https://quarkus.io/extensions">Browse Extensions</a>
+                <a class="navbar-item" href="https://quarkus.io/faq/#what-is-a-quarkus-extension">Use Extensions</a>
+                <a class="navbar-item" href="https://quarkus.io/guides/writing-extensions">
                   Create Extensions
                 </a>
+              <a class="navbar-item" href="https://hub.quarkiverse.io">
+                Share Extensions
+              </a>
             </div>
           </div>
         <div class="navbar-item has-dropdown is-hoverable">