configure_c2e_on_iot: Describe how to connect to our cloud2edge

This also changes the configuration to be in config.json instead of provisioning.json, mostly just because the former is what the tests actually use in practice. In addition, the tenant ID is assumed to be dev.apertis, which has already been set up with the Hono<->Ditto connection.

https://phabricator.apertis.org/T8946

Signed-off-by: Ryan Gonzalez ryan.gonzalez@collabora.com

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In draft state, because the cloud2edge instance doesn't actually exist yet, so I can't test the guide fully. That being said, the fundamentals should remain the same.