I tried this out. I think this app will benefit from a clear identification of purpose and target user base and tailoring its features around that.
Eg. If it is trying to be a generic markdown file editor, I wouldn't want it to insert yaml frontmatter without being more explicit about it. If it is trying to be a note taking tool, I'd expect to be able to interlink local markdown files and navigate files through them (I couldn't get that to work). If non technical users are the primary audience, the git integration may not be ideal sync solution for them. If it is for technical users, we would likely want to be able to edit the front matter ourselves (to add options specific to jekyll/pandoc or whatever else will use that markdown) etc.
Eg. If it is trying to be a generic markdown file editor, I wouldn't want it to insert yaml frontmatter without being more explicit about it. If it is trying to be a note taking tool, I'd expect to be able to interlink local markdown files and navigate files through them (I couldn't get that to work). If non technical users are the primary audience, the git integration may not be ideal sync solution for them. If it is for technical users, we would likely want to be able to edit the front matter ourselves (to add options specific to jekyll/pandoc or whatever else will use that markdown) etc.