graphviz install documentation coverage

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Bug Report

Description

DataJoint for Python has a dependency on graphviz binaries. This is outlined clearly for the windows install steps, but not covered for other platforms, creating confusion (see also: https://github.com/datajoint/datajoint-python/issues/924)

Expected Behavior

Documentation of prerequizites for all platforms.

Additional Research and Context

Relatedly, windows documentation on install has open issues related to similar topics; might make sense to rework 'as a set':

https://github.com/datajoint/datajoint-docs/issues/229 https://github.com/datajoint/datajoint-docs/issues/245