Use system zsh plugins, remove redundant waybar network modules

- Source zsh-autosuggestions and zsh-syntax-highlighting from
  /usr/share/zsh/plugins/ instead of oh-my-zsh custom dir
- Add both as official packages
- Remove waybar network and custom/vpn modules (nm-applet covers this)
- Move tray from modules-left to first position in modules-right

defaults/xdg/waybar/config

@@ -8,7 +8,6 @@
     "modules-left": [
         "group/sys",
         "niri/workspaces",
-        "tray",
         "wlr/taskbar",
         "niri/window"
     ],
@@ -16,9 +15,10 @@
 
     ],
     "modules-right": [
+        "tray",
         "mpris",
         "custom/cpugov",
-        "group/net",
+        "bluetooth",
         "group/sound",
         "backlight",
         "battery",
@@ -34,14 +34,6 @@
             "privacy"
         ]
     },
-    "group/net": {
-        "orientation": "inherit",
-        "modules": [
-            "custom/vpn",
-            "network",
-            "bluetooth"
-        ]
-    },
     "group/stats": {
         "orientation": "inherit",
         "modules": [
@@ -73,23 +65,6 @@
             "clock"
         ]
     },
-    "network": {
-        "format-wifi": "{icon}",
-        "format-ethernet": " {ifname}",
-        "format-disconnected": "󰱟 Offline",
-        "tooltip-format": "󰊗 {ifname} via {gwaddr}",
-        "tooltip-format-wifi": "  WiFi {essid} ({signalStrength}%)",
-        "tooltip-format-ethernet": "󰱔 {ifname}",
-        "tooltip-format-disconnected": "Disconnected",
-        "on-click": "nm-connection-editor",
-        "format-icons": [
-            "󱛅",
-            "󱛂",
-            "󱛃",
-            "󱚽"
-        ],
-        "max-length": 5
-    },
     "tray": {
         "icon-size": 15,
         "spacing": 10
@@ -364,14 +339,6 @@
         "tooltip-format-activated": "󱎴  No Lockscreen on idle",
         "tooltip-format-deactivated": "󰷛  Lockscreen on idle"
     },
-    "custom/vpn": {
-        "format": "󰖂",
-        "exec": "echo '{\"class\": \"connected\", \"tooltip\": \"VPN Connected\"}'",
-        "exec-if": "nmcli -t -f TYPE,STATE connection show --active | grep -qE '^(vpn|wireguard):'",
-        "return-type": "json",
-        "interval": 5,
-        "signal": 9
-    },
     "power-profiles-daemon": {
         "format": "{icon}",
         "tooltip-format": "Power profile: {profile}\nDriver: {driver}",