Add articles to SUMMARY

Author: sofietoft

15/umbraco-cms/SUMMARY.md

@@ -29,7 +29,14 @@
   * [Property Editors](fundamentals/backoffice/property-editors/README.md)
     * [Built-in Property Editors](fundamentals/backoffice/property-editors/built-in-umbraco-property-editors/README.md)
       * [Rich Text Editor](fundamentals/backoffice/property-editors/built-in-umbraco-property-editors/rich-text-editor/README.md)
+        * [Configuration](fundamentals/backoffice/property-editors/built-in-umbraco-property-editors/rich-text-editor/configuration.md)
+        * [Plugins](fundamentals/backoffice/property-editors/built-in-umbraco-property-editors/rich-text-editor/plugins.md)
+        * [Blocks](fundamentals/backoffice/property-editors/built-in-umbraco-property-editors/rich-text-editor/blocks.md)
       * [Rich Text Editor TinyMce](fundamentals/backoffice/property-editors/built-in-umbraco-property-editors/rich-text-editor-tinymce/README.md)
+        * [Configuration](fundamentals/backoffice/property-editors/built-in-umbraco-property-editors/rich-text-editor-tinymce/configuration.md)
+        * [Styles](fundamentals/backoffice/property-editors/built-in-umbraco-property-editors/rich-text-editor-tinymce/styles.md)
+        * [Plugins](fundamentals/backoffice/property-editors/built-in-umbraco-property-editors/rich-text-editor-tinymce/plugins.md)
+        * [Blocks](fundamentals/backoffice/property-editors/built-in-umbraco-property-editors/rich-text-editor-tinymce/blocks.md)
       * [Image Cropper](fundamentals/backoffice/property-editors/built-in-umbraco-property-editors/image-cropper.md)
 
 ## Implementation