Refactor app in to its own slice

slices/main/actions/recently_played/index.rb

@@ -0,0 +1,15 @@
+require "time_math"
+
+module Main
+  module Actions
+    module RecentlyPlayed
+      class Index < Action
+        include Deps["views.recently_played.index"]
+
+        def handle(req, res)
+          res.body = cache(key: "recently_played", content_proc: -> { index.call.to_str })
+        end
+      end
+    end
+  end
+end