Add ‘origin’ configuration property for dunst

oni/home/services/dunst.scm

@@ -136,6 +136,9 @@ notification width.")
   (notification-limit
    maybe-integer
    "The number of notifications that can appear at one time.")
+  (origin
+   (symbol 'top-right)
+   "The origin of the notification window on the screen.")
   (offset
    maybe-list-of-numbers
    "Respectively the horizontal and vertical offset in pixels from the corner of
@@ -257,6 +260,7 @@ horizontal axis.")
             (markup 'full)
             (format "<u>%s</u>\\n\\n%b")
             (width '(0 600))
+            (origin 'top-center)
             (idle-threshold 120)
             (padding 15)
             (horizontal-padding 15)