Update tenant lifecycle tooling and retire docs/process

docs/site/sidebars.js

@@ -100,40 +100,6 @@ const sidebars = {
       ],
     },
 
-    // Prozesse, Roadmap, Changes
-    {
-      type: 'category',
-      label: 'Prozess & Roadmap',
-      collapsed: true,
-      items: [
-        'process/README',
-        'process/roadmap',
-        {
-          type: 'category',
-          label: 'TODO / Epics',
-          items: [
-            'process/todo/security-hardening-epic',
-            'process/todo/paddle-migration',
-            'process/todo/paddle-catalog-sync',
-            'process/todo/localized-seo-hreflang-strategy',
-            'process/todo/media-streaming-upload-refactor',
-          ],
-        },
-        {
-          type: 'category',
-          label: 'Changes',
-          items: [
-            'process/changes/2025-09-08-session',
-            'process/changes/2025-10-02-registration-role-fixes',
-            'process/changes/2025-10-05-checkout-refactor-todo',
-            'process/changes/2025-10-09-paypal-sdk-migration',
-            'process/changes/2025-10-10-tenant-admin-onboarding-plan',
-            'process/changes/2025-11-08-coupon-ops',
-          ],
-        },
-      ],
-    },
-
     // Testing / Qualität
     {
       type: 'category',