Implement clock in worldclock using d3.

Generate the worldclock via d3 plus clean up the implementation.

SDUX-62
Move hour clock hand after each minute.

Instead of skipping once per hour, make it move in between.
Simplify world clock widget config.

SDUX-62
Add day to world clock.
Implement digital clock with a switch in config.
Update README

Add npm dependencies status badge.
Update npm dependencies.
Fix provider link on ingest settings page.