fish: remove battery function

fish/functions/battery.fish

@@ -1,16 +0,0 @@
-function battery --description "Print battery status"
-    if test (uname -s) != Darwin
-        echo "Unsupported kernel: "(uname -s)
-    else
-        set --local battery_status (pmset -g batt | string split0)
-        set --local battery_charge (echo $battery_status | rg --only-matching "\d+%")
-        set --local power_source (echo $battery_status | rg --only-matching  "[A-Za-z]+\sPower")
-
-        set_color green
-        echo "⚡️ Running on $power_source with $battery_charge charge"
-        set_color normal
-    end
-
-    # Repaint is needed since there is a keybinding for this function
-    commandline -f repaint
-end