Add note on size exceeded event message.
Fix identifiers to be consistent.
Add section on UserEvent message size limitiations.
Add links.
Add info re SolarNetwork messages.
Add screen shot of SolarFlux Monitor app.
Clarify that the node ID is the MQTT client ID, and the node certificate is provided.
Add info on new OCPP connection URLs.
Add example "tail -f" for SolarFlux.
Refine SolarFlux password terms.
Update with new fluxion.solarnetwork.net service info.
SolarFlux-API.md
Remove "event.topic" ref, which is automatically removed by node plugin now.
Move Publish section before Subscribe, for a more natural flow.
Add datum publish format (CBOR) details.
Add note on retained messages.
Remove refs to webhook configuration.
Initial SolarFlux page.