Sensor readings clockface

[babldev]

Show one or multiple live sensor readings instead of alerts.

[dogshapedangel]

+1, only being able to view sensor data from the web interface is super limiting and requires Chrome :(

[babldev]

Everyone wants this, so I'll add it.

I actually had it at one point for debugging...

Starting on it here #11

[babldev]

cc @mxr

[mxr]

Something like this with the time and AQI in the corner would be great