Show a notification on homepage and server info page if there is a new version available.

templates/homepage.html.twig

@@ -1,6 +1,13 @@
 {% extends "base.html.twig" %}
 
+{% import "components/new_version.macro.html.twig" as nv %}
+
 {% block content %}
+
+    {% if is_granted('@system.show_updates') %}
+        {{ nv.new_version_alert(new_version_available, new_version, new_version_url) }}
+    {% endif %}
+
     <div class="rounded p-4 bg-body-secondary">
         <h1 class="display-3">{{ partdb_title }}</h1>
         <h4>