Install.md: Additional graphviz installation steps for dj.Diagram()

[CBroz1]

Following the notebooks, I encountered errors when generating diagrams. Specifically, I saw the following:

FileNotFoundError: [Errno 2] "dot" not found in path.

Comments elsewhere indicate that graphviz needs to be installed system-wide (e.g., brew install graphviz) rather than installed via pip. Installing with brew fixed the issue in my case.

Should this be noted in documentation? Should dependency lists be refined elsewhere?

[sidml]

This fixes the issue
sudo apt install python-pydot python-pydot-ng graphviz
ref

[CBroz1]

Documentation on this topic will either be covered by the datajoint python documentation