[FEAT] Document Plugin Configuration

[NeonDaniel]

Objective

Plugin configuration is pretty standard among different plugins; for a section with module, a nested dict under key module is passed to the module init.

Initial Implementation Requirements

• Add a module config note to docs

Other Considerations

This may exist in OVOS docs; if there's a stable link to reference we may just insert that

[mikejgray]

@NeonDaniel Not entirely clear on what you mean by plugin configuration - do you mean things like PHAL, STT, TTS, Wakeword, etc? Or something else?