Scaffolding and Implementation plan

[nerdai]

Gameplan

1. Find all authors helper using reg-ex in chapter content, using find_authors
2. Sequentially erase all authors helpers from the content
3. Use handlebar template authors.hbs and render the found authors
4. Take the rendered html string and add it to the end of the chapter content
5. Figure out if need to make a cli for this and use CmdPreprocessor