GitLab

As discussed in https://github.com/microsoft/DeepSpeed/issues/662 this PR modifies the doc:
* explains what to use instead of CUDA_VISIBLE_DEVICES
* puts the `--hostfile` cl arg in the correct place in the invocation script

Fixes: https://github.com/microsoft/DeepSpeed/issues/662

Co-authored-by: Jeff Rasley <jerasley@microsoft.com>

Co-authored-by: Jeff Rasley <jerasley@microsoft.com>

This PR:
* fixes a misspelled method name
* also `( () )` doesn't read too well, until one reads the code and understands that it's not a formatting bug. I proposed to simply say that it's a callable object.

Co-authored-by: Shaden Smith <Shaden.Smith@microsoft.com>
Co-authored-by: Reza Yazdani <reyazda@microsoft.com>

* 1-bit adam (#353)
Co-authored-by: Jeff Rasley <jerasley@microsoft.com>
Co-authored-by: Your Name <you@example.com>
Co-authored-by: tanghl1994 <htang14@ur.rochester.edu>
Co-authored-by: Hank <tanghl1994@gmail.com>
Co-authored-by: root <root@node2x12b.cs.rochester.edu>
Co-authored-by: Ammar Ahmad Awan <awan.ammar@microsoft.com>

Updates for ZeRO stage 2 + ZeRO stage 1 w. RS
Co-authored-by: Tunji Ruwase <olruwase@microsoft.com>
Co-authored-by: Samyam Rajbhandari <samyamr@microsoft.com>
Co-authored-by: Shaden Smith <ShadenTSmith@gmail.com>
Co-authored-by: Elton Zheng <eltonz@microsoft.com>
Co-authored-by: Shaden Smith <Shaden.Smith@microsoft.com>
Co-authored-by: yuxionghe <yuxhe@microsoft.com>
Co-authored-by: Arash Ashari <arashari@microsoft.com>

* Better config filename

* Clean up configuration ToC

* Add coming soon to posts

* Add what's new section to main page