Eww: Modularized and improved CSS

modules/home/wayland/apps/eww/bar/windows/calendar.yuck

@@ -1,8 +1,3 @@
-(defwidget calendar-win []
-  (box
-    :class "calendar-win"
-    (calendar)))
-
 (defwindow calendar
   :monitor 0
   :geometry (geometry
@@ -11,4 +6,4 @@
   	:anchor "bottom right"
     :width "0px"
     :height "0px")
-  (calendar-win))
+  (window (calendar)))