Map flood sensor data

[matthewberryman]

• Water depth.
• Temperature (if available on device).
• Humidity (if available on device).
• Update API page with appropriate documentation

[tomasholderness]

See new IoT branch for progress - sensors now on map, next step is to build graph.

[matthewberryman]

Done in https://github.com/smart-facility/petajakarta-web/commit/9a9bfd0e15a7ef44fbff7236408d44ddd2d124e1