Simplified dashboard

The "dashboard" (aka the first view for either administrative or normal accounts) now includes information that should help debug start-up as well as help w/ identifying cameras which go off-line.

The "add-on" referenced is the Motion Classic (motion-video0) add-on in github.com/dcmartin/hassio-addons repository. It has REST API end-points for both its configuration (cgi-bin/config) and status (cgi-bin/status). Those are now captured as REST sensors and used to determine if the addon is configured and running.

The MQTT broker is also being monitored for activity greater-than zero (0) during the previous 1 minute; if no traffic occurs, then MQTT is not connected.

The YOLO (and soon face and alpr) has a configuration REST API, but the current 0.117.6 server is picking up an "upgrade" from the underlying HTTP libraries to find the output invalid (n.b. closed unexpectedly); IDK why, works w/ curl, but it's on the list. Therefore the status for YOLO is currently an MQTT sensor listening for the announcement when the AI starts; however, this sensor does not indicate if it is still running (hence the REST API). However, it should help with start-up.

LMK if you have question or need assistance in installing; best to find help on FB or Slack.