Ensuring consistent markdown format with mdformat

From the mdformat’s documentation page:

“Mdformat is an opinionated Markdown formatter that can be used to enforce a consistent style in Markdown files. Mdformat is a Unix-style command-line tool as well as a Python library.”

The rationale for using mdformat is the same as the one for using black which is to avoid spending any time thinking about the formatting of source files.

Examples of choices that mdformat will make:

# Hello world

Here is how to write some python code:

   print("Hello Nashpy!)

become:

# Hello world

Here is how to write some python code:

```
print("Hello Nashpy!)
```