UI: HA status should be reported visually
We need to improve presentation of the HA status:
- use green/yellow/red notation to designate the status
- HA status should be available on the Kea apps list
- if HA hook is not present, the status should not be red error (gray perhaps). Also, the text should be toned down to explain it's not an error. Many choose to not use HA and it's a valid deployment.