Add support for simple tasks without link to markdown file

[crazyhappygame]

Hey,

Thank you, great project.

I have many markdown files similar to below:

# kanban

## Backlog

## Todo

- task 1
- task 2

## In Progress

- task 3

## Done

Is it possible to add support/visualization for markdown files with task name only (without "links to task markdown files")?
Most of the time my tasks are really simple just title only. Most of the time I do not need all features described here: https://github.com/basementuniverse/kanbn/blob/master/docs/task-structure.md