[DeepSpeed docs] new information
As I bombarded the DeepSpeed with multiple Issues, as the answers are starting to percolate back, so I will gather them in this PR. So I will let it sit for a while collecting updates, unless users will need those answers sooner.

* [x] how to run DeepSpeed with a 1 gpu which is not GPU 0 (`CUDA_VISIBLE_DEVICES` can't be used)
* [x] add a newly published paper to resources 
* [x] various small additions/improvements 