Edit CMA-MAE and lunar lander tutorials

[btjanaka]

Description

As was introduced in #291, this tutorial shows how to run CMA-MAE with the lunar lander.

TODO

• [x] Edit CMA-MAE tutorial
• [x] Edit lunar lander tutorial to match
• [x] Run through CONTRIBUTING checklist for CMA-MAE

Questions

Status

• [x] I have read the guidelines in CONTRIBUTING.md
• [x] I have formatted my code using yapf
• [x] I have tested my code by running pytest
• [x] I have linted my code with pylint
• [x] ~I have added a one-line description of my change to the changelog in HISTORY.md~
• [x] This PR is ready to go