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 files in the repository and reviewing the Appendix in the training manual for any design guidance. Compare the current slides with the intended visual direction; the work is done when the deck has a clearly agreed, improved appearance.

由索引模型根据 Issue 内容生成。