v9.4.0

- Update to v9.4.0 of https://github.com/swcarpentry/styles/
- Update info on formative assessments
- Remove episode length
- Update maintenance process
- Fix link to setup instructions
- Ensure Ruby is updated to work with Jekyll on OSX
- Fix class mismatch in formatting lesson
- Avoid "Click Here" for links
- Specify release repo unambiguously
- Adding How to add R packages
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