feat(sidebar): use tag number widget

widget/tag-number.fnl

@@ -0,0 +1,20 @@
+(local awful (require :awful))
+(local beautiful (require :beautiful))
+(local wibox (require :wibox))
+
+(fn tag-number [s]
+  (awful.widget.taglist
+   s
+   awful.widget.taglist.filter.selected
+   {}
+   {:taglist_disable_icon true
+    :bg_empty beautiful.bg_normal
+    :bg_focus beautiful.bg_focus
+    :bg_occupied beautiful.bg_normal
+    :bg_urgent beautiful.bg_normal
+    :font beautiful.font_mono}
+   awful.widget.common.list_update
+   ;; (require :widget.list_update)
+   (wibox.layout.fixed.vertical)))
+
+tag-number