massive improvements to tests, streamlined and synced migrations, fixed a lot of wrong or old table field references. implemented a lot of pages in react for website frontend

database/seeders/DemoEventSeeder.php

@@ -19,9 +19,9 @@ class DemoEventSeeder extends Seeder
             'description' => ['de'=>'Demo-Event','en'=>'Demo event'],
             'date' => now()->addMonths(3)->toDateString(),
             'event_type_id' => $type->id,
-            'status' => 'published',
+            'status' => 'active',
             'is_active' => true,
-            'settings' => [],
+            'settings' => json_encode([]),
             'default_locale' => 'de',
         ]);
     }