services cleanup. powersave features and shellcheck fixes

sdcard/boot/config.txt

@@ -1195,3 +1195,12 @@ dtoverlay=dwc2
 dtparam=spi=on
 dtoverlay=spi1-3cs
 
+# Powersave options
+# Disable power LED ~30ma
+dtparam=act_led_trigger=none
+dtparam=act_led_activelow=on
+# Disable bluetooth
+dtoverlay=pi3-disable-bt
+# Disable audio
+dtparam=audio=off
+

sdcard/rootfs/etc/rc.local

@@ -10,5 +10,7 @@
 # bits.
 #
 # By default this script does nothing.
+# Powersave (Disable HDMI) ~30ma
+/opt/vc/bin/tvservice -o
 /root/pwnagotchi/scripts/startup.sh &
 exit 0