Geometry optimization three regions

[NooraAz]

In this tutorial, we are going to give an example of geometry optimization for a protein.

[roccomoretti]

Note we also have https://github.com/RosettaCommons/demos for things which are more tutorial-like (e.g. things which include input files, etc.) This (at least the .md portions) is also available on the web at https://www.rosettacommons.org/demos/latest/

It's not necessarily bad to put "how tos" in the documentation repository, but if things get more involved, it might be reasonable to move things over.

[vmullig]

@NooraAz I've added RosettaCommons/demos#30 so that we can move this over to the demos repo.

[vmullig]

(@roccomoretti We may have a few things that we move from the documentation repo to the demos repo in the next while. But yes, we should make sure that everything is in the right place.)