minimize SD card writes

[Nate-Boyette]

reduce SD card write operations to extend life of card. see nucleus_os/docs/minimize_sd_wear.md

[Nate-Boyette]

testing now on s/n 0002

[Nate-Boyette]

testing seems to be good. need to implement on s/n 0003 and 0004 and confirm this is active in deploy.sh