Refactor app in to its own slice

slices/main/repos/trip_repo.rb

@@ -0,0 +1,20 @@
+module Main
+  module Repos
+    class TripRepo < Adamantium::Repo[:trips]
+      def fetch!(id)
+        trips
+          .where(id: id)
+          .combine(posts: :tags)
+          .one!
+      end
+
+      def list
+        trips
+          .published
+          .order(:start_date)
+          .reverse
+          .to_a
+      end
+    end
+  end
+end