https://en.wikipedia.org/wiki/Markdown

There is no official Markdown specification and there are many different \
implementations.\
This seems intended by the creators of the language.

#### TODO

- print header tree
- delph deeper into different Markdown implementations (like CommonMark)
- add support for "Setext-style headers"

#### logic ideas

For a tree structure you will probably need parent/child relationships.\
You might need to create a parent and a child field in the header struct.