Refactor app in to its own slice

slices/main/views/bookmarks/show.rb

@@ -0,0 +1,13 @@
+module Main
+  module Views
+    module Bookmarks
+      class Show< Main::View
+        include Deps["repos.post_repo"]
+
+        expose :bookmark do |slug:|
+          Decorators::Bookmarks::Decorator.new(post_repo.fetch!(slug))
+        end
+      end
+    end
+  end
+end