downgrade to kirby v3

kirby/router.php

@@ -1,12 +1,11 @@
 <?php
 
-// prepend a fake host to ensure that PHP can parse the path even if it contains weird stuff;
-// afterwards just take the plain path back out from the parsed result
-$uri = parse_url('https://getkirby.com/' . ltrim($_SERVER['REQUEST_URI'], '/'), PHP_URL_PATH) ?? '/';
-$uri = urldecode($uri);
+$uri = urldecode(
+	parse_url($_SERVER['REQUEST_URI'], PHP_URL_PATH)
+);
 
 // Emulate Apache's `mod_rewrite` functionality
-if ($uri !== '/' && file_exists($_SERVER['DOCUMENT_ROOT'] . '/' . ltrim($uri, '/'))) {
+if ($uri !== '/' && file_exists($_SERVER['DOCUMENT_ROOT'] . '/' . $uri)) {
 	return false;
 }