Add infrastructure diagrams

[viniciusdc]

closes Quansight-Labs/czi-conda-forge-mgmt#34

It is working in progress to outline the base infrastructure knowledge around conda-forge ecosystem and provide some insight into its automation backbone.

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[jaimergp]

Cool! This is the preview, for those wondering.

Some notes:

• Why do we have different styles across diagrams? I like the one in the top one and ideally we would maintain consistency across them. Not critical right now, but something to keep in mind.
• Can we add a legend on the specific meaning of the different colors, arrow types and verb-labels used? Or, if these are standardized by some external resource, link to it prominently? Thanks!