* design counter on connection board
* display time of last update and add reload button
* chance `Updated` field to a real button
* Provide counter values for the dashboard
* change background color ot the top branch
- use dark-grey instead of black to reduce the contrast
* change color of counter tiles
* test proxy connection counter handling
* prepare conn-table and notes list building
* remove obsolete menue points
* store client mode for dashboard
* store inverters serial number for the dashboard
* store inverters serial number
* build connection table for dashboard
* add connection table to dashboard
* fix responsiveness of the tiles
* adapt unit tests
* remove test fake code
* increase test coverage, remove obsolete if statement
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