Top menu improvements
Current behavior
The top menu is missing some features.

Expected behavior
File could contain the following entries:
- New Note
- Clone Note
- Delete Note
- Import Note(s)
- Export Note
- as Markdown
- as HTML
- as PDF
- Preferences
- Sync storages
Edit could also contain the following entries:
- Generate/update TOC
- Format table
Help could also contain the following entries:
- About/Version
- Check for updates
also: version
Also suggest to add "Preferences" to the menu, in addition to its button under the top-menu. I understand it'd be a duplicate, but usually users look for Preferences in the menu first. Not a big deal to have a duplicate I guess, if that's make the UX a little more convenient.
In small screens, it'd be helpful to be able to close/fold the list of notes to the left side. This feature was available in the legacy app. Folders were given a color, so one could recognize and switch to the needed folder by color. This feature could be added as well, or just closing and opening the notes pane would be good.
Those additions would indeed be great. They are addressed in separate issues: #333 and #334. Give those a 👍
After #333 is merged we can also add it to the View menu.
I'll review this and finalize the specs soon.