Restructure elements and components

sass/elements/elements.sass

@@ -1,12 +1,14 @@
 @charset "utf-8"
 
 @import "controls"
-@import "buttons"
-@import "titles"
-@import "images"
-@import "messages"
-@import "notifications"
+
+@import "button"
+@import "content"
+@import "image"
+@import "notification"
 @import "progress"
+@import "table"
+@import "title"
 
 .delete
   +unselectable