update options to allow drag/drop betweeen parents and children

[gregvanbrug]

Summary

Fixes a bug where pages were not able to be dragged between different levels of hierarchy.

What are the specific steps to test this change?

1. npm run dev
2. Use the Page manager to create Pages, navigate to a Page and create a Child Page.
3. Edit the Page Tree by dragging Pages. You should be able to move Pages between different levels of heirarchy.

What kind of change does this PR introduce?

• Bug fix
• New feature
• Refactor
• Documentation
• Build-related changes
• Other

Make sure the PR fulfills these requirements:

• It includes a) the existing issue ID being resolved, b) a convincing reason for adding this feature, or c) a clear description of the bug it resolves
• The changelog is updated
• Related documentation has been updated
• Related tests have been updated

[linear]

PRO-5898 As an editor, I can only drag and drop a page within the same level of the content tree, but not to another level.

[boutell]

Well that was easy!

Please update the changelog.