feat(wiki): markdown editor

- Add a patch to convert 'content' field's value in existing Wiki Page records from Rich Text (HTML) to Markdown
- Update the 'content' field's type in the Wiki Page Doctype to 'Markdown Editor’
- Convert existing editor to markdown in the frontend

package.json

@@ -16,6 +16,7 @@
     "@tiptap/extension-text-align": "^2.0.2",
     "@tiptap/pm": "^2.0.2",
     "@tiptap/starter-kit": "^2.0.2",
+    "ace-builds": "^1.36.2",
     "htmldiff-js": "^1.0.5",
     "lowlight": "^2.8.1",
     "pre-commit": "^1.2.2"

wiki/patches.txt

@@ -7,3 +7,4 @@ wiki.wiki.doctype.wiki_feedback.patches.delete_wiki_feedback_item
 [post_model_sync]
 wiki.wiki.doctype.wiki_space.patches.wiki_sidebar_migration
 wiki.wiki.doctype.wiki_settings.patches.wiki_navbar_item_migration
+wiki.wiki.doctype.wiki_page.patches.convert_to_markdown