Add support for mindmap (markmap.js)

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I would love to see this integrated in GitLab:

• https://markmap.js.org/repl

About markmap-lib

Markmap is a combination of Markdown syntax and mindmap. It is first implemented by markmap.

markmap-lib is a reimplementation of markmap, with some additional features.

Usage:

Input some markdown:

# fruits

- banana
- mango
  - raw
  - ready to eat
- melon
  - Watermelon
  - Cantaloupe Melon
  - Horned Melon
  - Crenshaw Melon
- orange

Enjoy the interactive mindmap

It seems also to work with headings, as this is perhaps easier to edit

# fruits

## banana
## mango

### raw
### ready to eat

## melon
- Watermelon
- Cantaloupe Melon
- Horned Melon
- Crenshaw Melon

## orange