Updated lesson_initialize
Updated lesson_initialize

Clarified instructions for using GitHub to contribute, altered link for [issues] to direct to GitHub page on navigating issues to avoid FIXME issue with link when initializing, removed link to master repo to avoid FIXME issue with link when initializing. These suggestions were based on a pull request initially done elsewhere swcarpentry/shell-novice#639
Reproducible-Science-Curriculum/rr-literate-programming,Reproducible-Science-Curriculum/rr-automation,Reproducible-Science-Curriculum/rr-literate-programming,Reproducible-Science-Curriculum/rr-automation