Consolidate with Forest-Tutorials

[kalzoo]

Include https://github.com/rigetti/forest-tutorials here and deprecate that repository. Why?:

• They serve nearly the same purpose, but the latter builds on this repo with a suite of jupyter notebook files that could easily be kept here
• This extra layer adds more work in propagating updates, fixes, and other changes
• The dependencies for forest-tutorials are installed ... from a requirements.txt file in this repo.

This was likely set up like this for one of two reasons:

• Binder uses a Dockerfile as "configuration of last resort" and so this layering prevents Binder from seeing anything but the Dockerfile at the forest-tutorials level
• Prevent "bloat" of extra notebooks in the forest-notebook docker image ... in reality, this is negligible compared to the overall size of the image. There already is a more-minimal image below this one, rigetti/forest, and having two layers on top of that is unnecessary.

As a confirmation of the rationale here, the Readmes for the two repos are quite similar, mostly overlapping in content. that suggests they serve a single purpose.