major update

lib/Service/Docs/DocsCatalogService.php

@@ -30,6 +30,12 @@ class DocsCatalogService
     private static function humanizeGroupLabel(string $groupHeading): string
     {
         $knownGroups = [
+            'Lernpfad (chronologisch)' => t('Learning path'),
+            'Konzepte (Explanation)' => t('Concepts'),
+            'Aufgabenanleitungen (How-to)' => t('How-to guides'),
+            'Referenz (Reference)' => t('Reference'),
+            'Betrieb (Operations)' => t('Operations'),
+            'Mitwirken (Contributor Guide)' => t('Contributor guide'),
             'Start hier (neue Entwickler)' => t('Getting started'),
             'Architektur und Regeln' => t('Architecture & rules'),
             'Frontend' => t('Frontend'),
@@ -189,7 +195,7 @@ class DocsCatalogService
 
     public static function defaultSlug(): string
     {
-        return array_key_first(self::allDocs()) ?: 'erste-schritte';
+        return array_key_first(self::allDocs()) ?: '00-systemueberblick';
     }
 
     public static function docPathBySlug(string $slug): ?string