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/admin-beheerder.md

@@ -2,14 +2,14 @@
 
 The admin manager guide contains the following topics:
 
-- **Dashboard** - Website overview
-- **Content management** - Managing files and pages
-- **Configuration** - Site settings
-- **Theme management** - Managing and creating themes
-- **Security** - Bot protection and sessions
-- **Plugins** - Managing and creating plugins
-- **Users** - Adding and removing users
-- **Statistics** - Viewing visitor statistics
+- **Dashboard** - Role-based overview of the website (Admin, Content Manager, BI Manager, Site Admin)
+- **Content management** - Managing files and pages with layout selection and plugins
+- **Configuration** - Site settings (title, language, author, analytics, logging)
+- **Theme management** - Managing, activating and creating themes (SCSS compilation)
+- **Security** - Bot protection, rate limiting and session settings
+- **Plugins** - Managing plugins: content (sidebar) and system (admin menu/API)
+- **Users** - User management with roles (Admin, Content Manager, BI Manager, Site Admin)
+- **Statistics** - Viewing and exporting visitor statistics
 - **Logs** - Viewing and filtering log files
 
 Select a topic from the navigation on the left.