Standardise more icons using material design style

nixos/home-manager/env/config/waybar/config

@@ -126,21 +126,21 @@
         "format-alt": "{ifname}: {ipaddr}/{cidr}"
     },
     "pulseaudio": {
-        // "scroll-step": 1, // %, can be a float
+        "scroll-step": 2, // %, can be a float
         "format": "{volume}% {icon} {format_source}",
         "format-bluetooth": "{volume}% {icon} {format_source}",
-        "format-bluetooth-muted": " {icon} {format_source}",
-        "format-muted": " {format_source}",
-        "format-source": "{volume}% ",
-        "format-source-muted": "",
+        "format-bluetooth-muted": "󰝟 {icon} {format_source}",
+        "format-muted": "󰝟 {format_source}",
+        "format-source": "{volume}% 󰍬",
+        "format-source-muted": "󰍭",
         "format-icons": {
-            "headphone": "",
-            "hands-free": "",
-            "headset": "",
-            "phone": "",
-            "portable": "",
-            "car": "",
-            "default": ["", "", ""]
+            "headphone": "󰋋",
+            "hands-free": "󰥰",
+            "headset": "󰋎",
+            "phone": "󰏲",
+            "portable": "󰏳",
+            "car": "󰄍",
+            "default": ["󰕿", "󰖀", "󰕾"]
         },
         "on-click": "pavucontrol"
     },