Merged the Type Class lessons and moved the Extension Methods lesson #2659
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I merged the two Type Class lessons, primarily by copying content from one into the other. I also moved the Extension Methods lesson to be the first Contextual Abstractions lesson. Then I updated all the relevant file numbers (
num:
field) and next/previous fields, and updated the Contextual Abstractions introduction to reflect the Extension Methods lesson being the first lesson in this section.It’s possible that these lessons could all be reordered, but I didn’t know what the right answer is yet, so I stopped there.