chore(admonitions): start off with a fresh copy of blockquote plugin

packages/ckeditor5-admonition/docs/_snippets/features/block-quote-source.js

@@ -0,0 +1,51 @@
+/**
+ * @license Copyright (c) 2003-2024, CKSource Holding sp. z o.o. All rights reserved.
+ * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
+ */
+
+/* globals window */
+
+import { CKBox, CKBoxImageEdit } from '@ckeditor/ckeditor5-ckbox';
+import { PictureEditing, ImageInsert, ImageResize, AutoImage } from '@ckeditor/ckeditor5-image';
+import { LinkImage } from '@ckeditor/ckeditor5-link';
+import { CS_CONFIG } from '@ckeditor/ckeditor5-cloud-services/tests/_utils/cloud-services-config.js';
+import { TOKEN_URL } from '@ckeditor/ckeditor5-ckbox/tests/_utils/ckbox-config.js';
+
+// Umberto combines all `packages/*/docs` into the `docs/` directory. The import path must be valid after merging all directories.
+import ClassicEditor from '../build-classic.js';
+
+ClassicEditor.defaultConfig = {
+	plugins: ClassicEditor.builtinPlugins.concat( [
+		PictureEditing,
+		ImageResize,
+		ImageInsert,
+		AutoImage,
+		LinkImage,
+		CKBox,
+		CKBoxImageEdit
+	] ),
+	cloudServices: CS_CONFIG,
+	toolbar: {
+		items: [
+			'undo', 'redo', '|', 'heading',
+			'|', 'bold', 'italic',
+			'|', 'link', 'insertImage', 'insertTable', 'blockQuote', 'mediaEmbed',
+			'|', 'bulletedList', 'numberedList', 'outdent', 'indent'
+		]
+	},
+	ui: {
+		viewportOffset: {
+			top: window.getViewportTopOffsetConfig()
+		}
+	},
+	ckbox: {
+		tokenUrl: TOKEN_URL,
+		allowExternalImagesEditing: [ /^data:/, 'origin', /ckbox/ ],
+		forceDemoLabel: true
+	},
+	image: {
+		toolbar: [ 'toggleImageCaption', 'imageTextAlternative', 'ckboxImageEdit' ]
+	}
+};
+
+window.ClassicEditor = ClassicEditor;