Zed v1.20 adds Markdown previews and custom window titles

Zed v1.20 adds customizable window titles using details such as the project name, file name, relative path, Git branch, and remote name.

It can also open Markdown files directly in rendered preview when 'markdown_preview.open_markdown_files_in_preview' is enabled.

The release adds Emmet wrapping for selected content through 'editor: wrap with abbreviation', plus an optional cursor movement animation.