Update ghostwriter to 2.1.1

Summary:
Summarized Changelog

• Untitled documents are no longer created upon opening or closing a new, empty document
• Updated Chinese translation

Full changelog here

Test Plan: - Edited and previewed some markdown documents

Reviewers: Triage Team, joebonrichie

Reviewed By: Triage Team, joebonrichie

Differential Revision: https://dev.getsol.us/D12536