Dmol-book

* Added `linkify` to dependencies
* Fixed Issues 221, 202, 191, 215, 174, 201, 220, 211, 197, 198, 204

* Fixed sklean pip install name
* Updated batch norm discussion
* Added exercises to GNN, XAI chapters
* Fixed discussion of pooling invariance
* Progress on molnet chapter

* Added simpletransformers and e3nn dependencies
* Added two new chapters - e3nn_traj, pre-training
* Various fixes in Equivariant, tuning chapters.

* Various typos/bug fixes in chapters
* Fixed import errors in dmol package
* Removed constantly failing branch deploy

* Added more information on stereochemistry
* Added autoplayer for mp4s

* Livecommsj release