Update configuration.md (#79)

* docs: add warning for Energy Efficient contactors

* Update configuration.md (#170)

configuration.md: add "Disabled" comment

* Update configuration.md

First try to change the big ugly code block to proper markdown.

* Update configuration.md

update MQTT API. You don't feed the MAINS or EV METER.

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Co-authored-by: dingo35 <[email protected]>
Co-authored-by: demerstraat <[email protected]>

Author: 3 people