First off - this is a very interesting app, and the interface is clean. I think this would actually be useful in many contexts.

However, I'm looking for something that's less of a local CMS, and more of just... a document editor which can open up HTML files, edit them with a GUI interface, and save them somewhere.

Ideally, it would be an editor like Sublime, where you can drag a folder containing HTML files in there (so you can navigate folders and access other files & content), and edit visually...