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.

Start by locating the slide deck in the repository and review the Appendix in the training manual for guidance. The issue provides no file or test location and does not define specific visual changes; done would mean delivering a visibly improved slide-deck design agreed by the project team.

由索引模型根据 Issue 内容生成。