Added swappiness configuration to prevent uneeded swapping of pages out of memory
The 25 was chosen (after playing around with several values) as it will reduce pageing done for preseving cache in memory instead of swapping it out (https://www.kernel.org/doc/html/latest/admin-guide/sysctl/vm.html#swappiness) this will reduce wear on eMMC chips and should improve precieved resposivness of the device