Update all guides (NL + EN) for CodePress 2.5.2 features

- Admin guide: RBAC roles, role-based dashboard, plugin types (content/system)
- CodePress developer guide: plugin types, admin plugin API, SCSS compilation, asset serving
- Theme developer guide: SCSS sole CSS source, css_compiled read-only, guide layout
- Content manager guide: layout selection from theme.json, plugin order in frontmatter
- Both NL and EN updated with identical structure
- 35 files updated

guide/en/theme-developer/theme-json.md

@@ -2,20 +2,45 @@
 
 ```json
 {
-  "title": "My Theme",
-  "default_layout": "full_content",
-  "header_color": "#0a369d",
-  "layouts": {
-    "full_content": "full_content.twig",
-    "left_sidebar": "left_sidebar.twig",
-    "right_sidebar": "right_sidebar.twig"
-  }
+    "title": "My Theme",
+    "config": {
+        "default_template": "full_content"
+    },
+    "template": {
+        "full_content": "full_content.twig",
+        "left_sidebar": "left_sidebar.twig",
+        "right_sidebar": "right_sidebar.twig",
+        "custom1": "custom1.twig",
+        "guide": "guide.twig"
+    }
 }
 ```
 
 ## Fields
 
-- `title` - Display name in admin
-- `default_layout` - Default layout for new pages
-- `header_color` - Admin sidebar color
-- `layouts` - Mapping of layout names to .twig files
+- `title` — Display name in admin
+- `config.default_template` — Default layout for pages without a `layout:` frontmatter (fallback for unknown layouts)
+- `template` — Mapping from layout name to `.twig` file
+
+## Template mapping
+
+The `template` mapping defines which layouts are available. Each key is a layout name, each value is the `.twig` file:
+
+| Layout name | Twig file | Description |
+|-------------|-----------|-------------|
+| `full_content` | `full_content.twig` | Full width, no sidebar |
+| `left_sidebar` | `left_sidebar.twig` | Sidebar on the left |
+| `right_sidebar` | `right_sidebar.twig` | Sidebar on the right |
+| `custom1` | `custom1.twig` | Custom layout |
+| `guide` | `guide.twig` | Guide with sidebar (Navigation plugin) |
+
+## Layout selection
+
+- Layouts are chosen via the frontmatter `layout:` key in content files
+- Unknown layouts fall back to `config.default_template`
+- `ThemeManager::getTemplates()` returns the template mapping
+- `ThemeManager::getConfig()` returns the config section (including `default_template`)
+
+## Guide layout
+
+The `guide` layout is special for guides. `getGuidePage()` in `CodePressCMS.php` automatically injects the Navigation plugin into the metadata for sidebar navigation.