Create a diagram showing all of the ways that we can communicate with a Krake

[RobertLRead]

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I believe the developers' manual should document all of the ways (SPI, UART, MQTT, USB) that can be used to communicate with the Krake.

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I want a nice diagram.

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This might be a good time to split the User's Manual into the Operator Manual and Developer's Manual.

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[RobertLRead]

@nk25719 if you think this is a good idea we could plan who should do it.

[ForrestErickson]

Suggest Change:
From:

... all of the ways (SPI, UART, MQTT, USB) that can be used to communicate with...

to:

... all of the ways (5V SPI, RS232, MQTT, USB) that can be used to communicate with...

cc: @RobertLRead