[Feature] Open note's corresponding markdown file

[windingwind]

  Thanks for adding this wonderful feature, I might have a suggestion to add.

Since my workflow involves using neovim for fast typesetting of math, I would greatly benefit from having an "Open in External Editor" button for a synced Zotero note (and, maybe, also a keyboard shortcut) to open the corresponding .md file in a predefined external editor?
Much like Zotero allows an Open PDFs using option in the Edit > Preferences > General tab.

Thank you very much.

Originally posted by @DedZago in #244 (comment)