Output isn't markdown task formatted

[hittjwX]

For markdown-tasks-tree.py, the output is right-justified with [ ] rather than - [ ] text. If it's going to use markdown format, it might as well have no spaces before the first └── so it lines up with the tick.

Because tasks are unique at the top level, but can be dependent in duplicate, it may be better to format like the following:

• Represent a directory tree,
• Markdown Hierarchy Viewer,
• Tree Structure Visualization Generator,

Stripping the - [ ] altogether prevents duplicate tasks when exporting these relationships. The export wouldn't be good because it creates duplicate tasks.

Whatever method chosen prepares for Precedence Diagramming Method (PDM) graphics. I want a user to be able to extract tasks from markdown and generate an image for a presentation.