Support multiple batteries

Out of the box the primary battery status will be displayed in the i3-bar. For some laptops that has multiple batteries e.g. ThinkPad, you want to have both batteries displayed. To do so, follow the steps:

1. Stage your own i3 config file (tutorial), then open ~/.config/regolith/i3xrocks/config in your editor of choice.
2. Find the line that pertains to the battery blocklet:

...
# Battery indicator
#
# Displays total percentage charge left of specified battery.
[battery3]
interval=30
# instance=BAT0

3. List all the battery instances running on your machine by running:

ls /sys/class/power_supply/

# AC BAT0 BAT1

4. Update the staged config file to have a new blocklet as such:

...
# Battery indicator
#
# Displays total percentage charge left of specified battery.
[battery3]
interval=30
instance=BAT0

[battery3]
interval=30
instance=BAT1

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