Fix sitemap

Most importantly, make it work globally.

sitemap.php

@@ -0,0 +1,26 @@
+<?php
+
+require __DIR__ . '/load.lib.php';
+
+header('Content-Type: text/plain; charset=utf-8');
+
+$directory = new \RecursiveDirectoryIterator('.');
+$filter = new class($directory) extends \RecursiveFilterIterator {
+    public function accept() {
+        $components = explode('/', $this->current()->getPathname(), 4);
+        return ($this->current()->isDir() && !isset($components[2])) || (isset($components[2]) && $components[2] === 'pages');
+    }
+};
+$iterator = new \RecursiveIteratorIterator($filter);
+
+$isHttps = isHttps();
+foreach ($iterator as $info) {
+    if ($info->isFile()) {
+        [, $year, $pages, $page] = explode('/', $info->getPathname(), 4);
+        if (str_ends_with($page, '.pg') && !str_starts_with($page, 'cs/error/') && !str_starts_with($page, 'en/error/') && !str_starts_with($page, 'de/error/')) {
+            $file = substr($page, 0, -3);
+            $file = str_replace('/pages', '', $file);
+            echo ($isHttps ? 'https' : 'http') . '://' . $_SERVER['HTTP_HOST'] . '/' . $year . '/' . $file . "\n";
+        }
+    }
+}