feat(waybar): update battery module

* Remove `format-charging` and `format-plugged` settings in favor of just using the graduated battery level icons. Also  is a depreciated/removed Nerd Font icon. If we want to visually differentiate the charging state, CSS rules in `~/.config/waybar/style.css` might be a better way to handle that.
* Remove the commented lines because it is unlikely we will ever want these specific settings.
* Remove PBPbattery module and associated script. It is all commented out anyway. This feature has been built-in to Waybar for some time now; a custom script is no longer needed.

.config/waybar/config

@@ -23,7 +23,6 @@
         "pulseaudio",
         "custom/keyboard-layout",
         "battery",
-        //"custom/PBPbattery",
         "backlight#icon",
         "backlight#value",
         "clock",
@@ -41,26 +40,16 @@
             "deactivated": ""
         }
     },
-
+    
     "battery": {
         "states": {
-            // "good": 95,
             "warning": 30,
             "critical": 15
         },
-        "format": "{capacity}% {icon}",
-        "format-charging": "{capacity}% ",
-        "format-plugged": "{capacity}% ",
-        // "format-good": "", // An empty format will hide the module
-        // "format-full": "",
+        "format": "{icon} {capacity}%",
         "format-icons": ["", "", "", "", ""]
     },
 
-    "custom/PBPbattery": {
-        "exec": "~/.config/waybar/scripts/PBPbattery.sh",
-        "format": "{}",
-    },
-
     "clock": {
         "interval": 10,
         "format-alt": " {:%e %b %Y}", // Icon: calendar-alt