Ideas for new tutorials

This thread is meant to gather and organize ideas about new examples and tutorials to be added to the glTF Transform documentation (https://gltf-transform.donmccurdy.com/). Suggests, comments, questions, and upvotes are welcome. Requests for new feature development should probably be made in a new issue, instead.

Ideas:

- [ ] Building custom extensions
- [ ] Building custom pipelines
- [ ] Baking ambient occlusion with [three-gpu-pathtracer](https://github.com/gkjohnson/three-gpu-pathtracer/)
- [ ] Integrating drag-and-drop input to glTF Transform in a website
- [ ] Processing [3D Tiles](https://www.ogc.org/standard/3dtiles/)
- [ ] Loading glTF files into a custom renderer
- [ ] Exporting custom scene data to glTF

Start at the glTF Transform documentation site and review the listed tutorial ideas, such as custom extensions, custom pipelines, or loading glTF into a renderer. Choose and scope one idea with the maintainers; done means the selected example or tutorial is added to the documentation.

Written by the indexing model from the issue text.