More complete explanations

[hectorsector]

This PR fleshes out the explanations to a point where most folks should be able to follow them.

[github-learning-lab]

Your draft course version was created!

You can edit it using the Course Builder UI!

[github-learning-lab]

🔴 There was an error parsing your config.yml file.

YAMLException: can not read a block mapping entry; a multiline key may not be an implicit key at line 91, column 15:
          operator: test
                  ^

[github-learning-lab]

🔴 There was an error parsing your config.yml file.

YAMLException: unknown escape sequence at line 90, column 16:
          left: "/\s*if:\s*contains\s*\(\s*github\. ... 
                   ^

[github-learning-lab]

🔴 There was an error parsing your config.yml file.

YAMLException: incomplete explicit mapping pair; a key node is missed; or followed by a non-tabulated empty line at line 97, column 42:
     ...    expected: the conditional `if: contains(github.event.pull_req ... 
                                         ^

[github-learning-lab]

🔴 There was an error parsing your config.yml file.

YAMLException: bad indentation of a sequence entry at line 102, column 3:
      - type: respond
      ^

[hectorsector]

This probably needs a run through by someone and can then be merged!

[brianamarie]

I went through this and fixed one tiny sentence thing from my original commits, and also some logic that was looking for the wrong file name.

Thank you @hectorsector for making this better!

I'm going to merge this, and make the course public. It still needs to be made open source, but it should be ready to take for participants! cc @mattdavis0351 @crichID @carolynshin @a-a-ron

[brianamarie]

Running into some problems, but I'll open an issue in learning-lab.