add first draft of vfs and post processing docs

Author: davidemarcoli

app/docs/layout.tsx

@@ -6,6 +6,9 @@ import { source } from '@/lib/source';
 const tree: PageTree.Root = {
   name: 'docs',
   children: [
+    { name: 'Architecture', url: '/docs/architecture', type: 'page' },
+    { name: 'Deployment', url: '/docs/deployment', type: 'page' },
+    { name: 'Troubleshooting', url: '/docs/troubleshooting', type: 'page' },
     { name: 'Contribute to Wiki', url: '/docs/contribute', type: 'page' },
     {
       name: 'Frontend',
@@ -19,12 +22,20 @@ const tree: PageTree.Root = {
       type: 'folder',
       children: [
         { name: 'Overview', url: '/docs/services', type: 'page' },
+        {
+          name: 'Filesystem (VFS)',
+          type: 'folder',
+          children: [
+            { name: 'Overview', url: '/docs/services/filesystem', type: 'page' },
+            { name: 'Performance Tuning', url: '/docs/services/filesystem/performance', type: 'page' },
+          ],
+        },
         { name: 'Content Services', url: '/docs/services/content', type: 'page' },
-        { name: 'Downloaders', url: '/docs/services/downloaders', type: 'page' },
         { name: 'Scrapers', url: '/docs/services/scrapers', type: 'page' },
-        { name: 'Subtitles', url: '/docs/services/subtitles', type: 'page' },
-        { name: 'Symlink', url: '/docs/services/symlink', type: 'page' },
+        { name: 'Downloaders', url: '/docs/services/downloaders', type: 'page' },
         { name: 'Updaters', url: '/docs/services/updaters', type: 'page' },
+        { name: 'Post-Processing', url: '/docs/services/post-processing', type: 'page' },
+        { name: 'Subtitles', url: '/docs/services/subtitles', type: 'page' },
         { name: 'Notifications', url: '/docs/services/notifications', type: 'page' },
         { name: 'Management Commands', url: '/docs/services/extras', type: 'page' },
       ],