Improve schematic and pcb (add snubber network to driver output)

Some changes to the step down converter, Fix #8

Some little cleanups

Fix #13

Little update

Fix schematic error described in #8

Fix #5

Some little improvements

Update Capacitors

Remove connection to SLEEPn Pin I think we don't have to connect this pin, and if yes we can fix it manually on the prototype The support of Alegro wasn't very helpful about that topic