add diagrams to content section

[mehrsharma]

Adding diagrams to docs

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[KetanReddy]

Since this is talking about how flows are processed, instead of Node # could you use something like NavigationFlowState to tie it back to the types.

[KetanReddy]

Hey @mehrsharma! Thanks for the PR. Going to make this a patch release and mark it as skip-release since its only documentation updates. I have one minor point of feedback on one of the diagrams but it looks good!