> Can you please explain what Delide does?

Present anything Emacs can do with programmable, extensible, configurable slides & presentation steps made from org mode headings

Longer introductions are available in the documentation:

https://raw.githubusercontent.com/positron-solutions/dslide/refs/heads/unstable/doc/README.org
https://raw.githubusercontent.com/positron-solutions/dslide/refs/heads/unstable/doc/manual.org

The latest (upcoming) changes are available via the news file:

https://raw.githubusercontent.com/positron-solutions/dslide/refs/heads/unstable/NEWS.org

You can install it from Non-GNU ELPA. The package symbol is dslide.