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 read the Appendix in the training manual before assessing the existing presentation. Done means the deck has a consistently improved visual style, but the issue provides no concrete visual requirements or verification step.

Written by the indexing model from the issue text.