dunst: Create dunst config

In order to improve visibility of notifications add a custom
configuration.

.config/dunst/dunstrc

@@ -0,0 +1,20 @@
+[global]
+    follow = keyboard
+    scale = 2
+    idle_threshold = 3
+    font = Monospace 12
+    history_length = 100
+    corner_radius = 5
+    ignore_dbusclose = true
+    timeout = 0
+    background = "#333333"
+    frame_color = "#009900"
+
+[urgency_low]
+    foreground = "#009900"
+
+[urgency_normal]
+    foreground = "#ffee33"
+
+[urgency_critical]
+    foreground = "#aa3333"

.gitignore.d/i3

@@ -1,4 +1,5 @@
 *
+!/.config/dunst/dunstrc
 !/.config/i3/config
 !/.config/i3status-rust/config.toml
 !/.config/i3status-rust/secondary.toml