finally get rid of swaync, the last vestige of sway, and replace it with dunst; also, incorporate new notification displays for music and brightness

.config/waybar/config

@@ -54,6 +54,9 @@
         "tooltip-format": "󰠃 {artist}:  {title} (󰀥 {album})",
         "interval": 1,
         "album-len": 0,
+        "on-click": "exec ~/.bin/sh/dunstaudio.sh play_pause",
+        "on-click-right": "exec ~/.bin/sh/dunstaudio.sh next_track",
+        "on-click-middle": "exec ~/.bin/sh/dunstaudio.sh prev_track",
 	"player-icons": {
 		"default": "",
 		"mpv": ""
@@ -242,7 +245,9 @@
             "car": "",
             "default": ["", "󰖀", "󰕾", ""]
         },
-        "on-click": "pavucontrol"
+        "on-click": "pavucontrol",
+        "on-scroll-up": "exec ~/.bin/sh/dunstaudio.sh volume_up",
+        "on-scroll-down": "exec ~/.bin/sh/dunstaudio.sh volume_down"
     },
      "bluetooth": {
 	"format": "<span color=\"#6272a4\"></span> {status}",