Improvements on showKit page

[oscgonfer]

• Add link to metric in the docs instead of link to the main page on the More info link

• Improve visibility of failing sensors in the kit sensors belt (maybe with a small warning icon or with a color, that also triggers a small tooltip on hover: "We have detected that this sensor has not been sending data recently, probably there is an issue with your kit's hardware"
• Improve potatoness of avatar as in Avatar looks like a potato on kit profile page #468
• Improve kit details section

• Improve distinction between the graph area and this area (maybe by adding a border to the screen capture above or something like that.

• Add a title to the graph

• Add health checks on the kit (only on logged in). This is currently worked on the Enhancement/device health section #452 branch, but there would be items such as: battery level (or no battery connected), RSSI signal strength, missing sensors (see above), reset cause

  

[oscgonfer]

Review this: #376