Lesson Dev: Remove Creating 2nd Repo From Outline

[arockenberger]

https://github.com/arockenberger/github_collab_workshop/blob/master/workshop_outline_english.md#collaborate-by-suggesting-changes

Edit the text so that it reflects what we have done in the workshop on 2019-09-11: Keep working in the same repository (historical_recipes), involve /#3 and /#4.