Move repo download /update in to ajax backend code + added a button to check for updates

source/NerdPack/usr/local/emhttp/plugins/NerdPack/include/PackageQuery.php

@@ -1,5 +1,12 @@
 <?php
 require_once '/usr/local/emhttp/plugins/NerdPack/include/NerdPackHelpers.php';
+require_once '/usr/local/emhttp/plugins/NerdPack/include/DownloadHelpers.php';
+
+// Only download repo update if the current one is 1 hour old or more
+if (!is_file($repo_file) || !empty($_GET['force']) || (filemtime($repo_file) < (time() - 3600))) {
+	get_content_from_github($pkg_repo, $repo_file);
+	get_content_from_github($pkg_desc, $desc_file);
+}
 
 $pkgs_array = [];