Feature request: Table of contents Generator

[mfa777]

When we write a quite long document, it is necessary to have a tree inside the note.

But if we write it manually, it is boring and not so flexible.

Shall we add one button, when we click, table of contents will be generated automatically?

[JaspalSuri]

Thanks for your feedback! I've passed it along for the team to review. :)

[sonjoonho]

See also #26.