Update generators

[lizTheDeveloper]

The generators are out of date with the format:

• Update the insight generator to generate an insight that has the title and yaml structured properly
• Update the exercise generator to match the current format of exercises
• Update the course/subtopic generator match the current format of readme.md file
• Update the course/subtopic generator to include one sample workout called sample-workout, and add it to the workouts field, so that users understand that they must sequence workouts in the README.md file.
• Update the course/subtopic generator to include a standards field, with a sample standard or two