chore(deps): directly install prosemirror-markdown

ueberdosis/tiptap@032f8f1 removed `markdown` from `@tiptap/pm` package. Will need to install it directly from prosemirror.
Signed-off-by: Max <max@nextcloud.com>

Author: max-nextcloud

package-lock.json

@@ -94,6 +94,7 @@
     "mermaid": "^11.14.0",
     "mitt": "^3.0.1",
     "path-normalize": "^8.0.0",
+    "prosemirror-markdown": "^1.13.4",
     "proxy-polyfill": "^0.3.2",
     "slug": "^11.0.1",
     "tippy.js": "^6.3.7",

package.json

@@ -22,7 +22,7 @@
  */
 
 import { Extension, getExtensionField } from '@tiptap/core'
-import { MarkdownSerializer, defaultMarkdownSerializer } from '@tiptap/pm/markdown'
+import { MarkdownSerializer, defaultMarkdownSerializer } from 'prosemirror-markdown'
 import { DOMParser } from '@tiptap/pm/model'
 import { Plugin, PluginKey } from '@tiptap/pm/state'
 import markdownit from '../markdownit/index.js'

src/extensions/Markdown.js

@@ -5,7 +5,7 @@
 
 import { emit } from '@nextcloud/event-bus'
 import TiptapImage from '@tiptap/extension-image'
-import { defaultMarkdownSerializer } from '@tiptap/pm/markdown'
+import { defaultMarkdownSerializer } from 'prosemirror-markdown'
 import { Plugin, PluginKey } from '@tiptap/pm/state'
 import { VueNodeViewRenderer } from '@tiptap/vue-2'
 import extractAttachmentSrcs from '../plugins/extractAttachmentSrcs.ts'

src/nodes/Image.js

@@ -4,7 +4,7 @@
  */
 
 import TiptapImage from '@tiptap/extension-image'
-import { defaultMarkdownSerializer } from '@tiptap/pm/markdown'
+import { defaultMarkdownSerializer } from 'prosemirror-markdown'
 import { VueNodeViewRenderer } from '@tiptap/vue-2'
 import ImageView from './ImageView.vue'
 

src/nodes/ImageInline.js

@@ -3,7 +3,7 @@
  * SPDX-License-Identifier: AGPL-3.0-or-later
  */
 
-import { MarkdownSerializerState } from '@tiptap/pm/markdown'
+import { MarkdownSerializerState } from 'prosemirror-markdown'
 import { Node } from '@tiptap/pm/model'
 import { createMarkdownSerializer } from '../../extensions/Markdown.js'