Removing lectures and packages not used in 2019

[James-S-Santangelo]

• Removed mice, phaseR, and psych, which are no longer used in course material.
• Removed previous lectures on:
  1. Numerical models
  2. Time series
  3. Data viz
  4. Rmarkdown

Should mention this closes: #324

[aays]

To be honest, looking back at the reproducibility section of the R Markdown lecture, I kind of would like to see us reintroduce it in some capacity next year to get the students thinking even more about why reproducibility matters but also why working open isn't 'the norm' across all fields quite yet. It may also be worth providing the bits about formatting R Markdown documents as a reference, although I suppose we didn't last year and the students figured things out just fine all the same. Just a thought