Refactor app in to its own slice

slices/main/views/trips/index.rb

@@ -0,0 +1,15 @@
+module Main
+  module Views
+    module Trips
+      class Index< Main::View
+        include Deps["repos.trip_repo"]
+
+        expose :trip_years do
+          trip_repo
+            .list
+            .group_by { |trip| trip.start_date.year }
+        end
+      end
+    end
+  end
+end