Feature: Enabled the indent feature in the build.

package.json

@@ -41,6 +41,7 @@
     "@ckeditor/ckeditor5-heading": "^11.0.5",
     "@ckeditor/ckeditor5-highlight": "^11.0.5",
     "@ckeditor/ckeditor5-image": "^14.0.0",
+    "@ckeditor/ckeditor5-indent": "^10.1.0",
     "@ckeditor/ckeditor5-link": "^11.1.2",
     "@ckeditor/ckeditor5-list": "^12.1.0",
     "@ckeditor/ckeditor5-media-embed": "^11.1.4",

src/ckeditor.js

@@ -26,6 +26,8 @@ import ImageCaption from '@ckeditor/ckeditor5-image/src/imagecaption';
 import ImageStyle from '@ckeditor/ckeditor5-image/src/imagestyle';
 import ImageToolbar from '@ckeditor/ckeditor5-image/src/imagetoolbar';
 import ImageUpload from '@ckeditor/ckeditor5-image/src/imageupload';
+import Indent from '@ckeditor/ckeditor5-indent/src/indent';
+import IndentBlock from '@ckeditor/ckeditor5-indent/src/indentblock';
 import Link from '@ckeditor/ckeditor5-link/src/link';
 import List from '@ckeditor/ckeditor5-list/src/list';
 import MediaEmbed from '@ckeditor/ckeditor5-media-embed/src/mediaembed';
@@ -58,6 +60,8 @@ DecoupledEditor.builtinPlugins = [
 	ImageStyle,
 	ImageToolbar,
 	ImageUpload,
+	Indent,
+	IndentBlock,
 	Link,
 	List,
 	MediaEmbed,
@@ -87,6 +91,9 @@ DecoupledEditor.defaultConfig = {
 			'numberedList',
 			'bulletedList',
 			'|',
+			'indent',
+			'outdent',
+			'|',
 			'link',
 			'blockquote',
 			'imageUpload',