Restyle the Slides

## Do you have an eye for design?
Help us improve the look of the slide deck.
If you need help, check out the Appendix in the training manual.

Locate the slide deck in the repository and review the Appendix in the training manual before assessing its current styling. Identify the deck's relevant files and the visual changes needed; done should mean the slides have a visibly improved, consistent appearance, though the issue provides no specific acceptance criteria.

Written by the indexing model from the issue text.