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Make gentler intro for ggplot2 lesson #552
This is in response to Issue #542. The current ggplot2 lesson starts very abruptly and can be confusing to novices. In my teaching, I've found that using a little time to explain the logic of ggplot a bit more helps a lot. I've also found that building up the first graphic piece by piece works better than starting with the finished graphic and then backtracking to explain how it fits together.
All changes in this pull request are in the first section of the lesson (up to but not including the first challenge). There are two main (and separate) changes that have been made:
In my experience these changes make it much easier for learners to understand how ggplot works. The major disadvantage is that it probably adds ~5 minutes of instruction time.