update fledge internals article

[maelle]

or drop it

[maelle]

How does fledge work?

The package can parse a git history and a NEWS.md Markdown file, using the former to update the latter.

The git history is accessed with the gert package. Each message is considered: is it a merge commit? does it use the bullet syntax? does it use conventional commits? If the answer is yes to one of these three questions it is deemed newsworthy and parsed according to its type.

The NEWS.md file is parsed thanks to Pandoc: from Markdown to HTML and then from HTML to a nested list.