Generate dynamic credits on "Authors" page and get rid of manual credits AUTHORS.md
Ref: webcomics#160 (comment 759362)
Context:
The community credits listed on "Authors" part of the website is just a markdown-to-html display of AUTHORS.md .
Problem:
The AUTHORS.md is not maintained properly by translator and obsolete.
Proposal:
The refactor using info.json in all translations folder now allows the generation of a dynamic list of credits. The generator of credits (in sources) made for the book project can be reused.