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 and review the Appendix in the training manual for relevant guidance before assessing the current presentation. Confirm the intended visual direction and scope with the project maintainers; done means the deck has a consistently improved look and the changes are reviewable.

Written by the indexing model from the issue text.