Refactor app in to its own slice

slices/main/view.rb

@@ -0,0 +1,13 @@
+# auto_register: false
+# frozen_string_literal: true
+
+require "hanami/view"
+
+module Main
+  class View < Hanami::View
+    config.default_context = Adamantium::Context.new
+    config.layouts_dir = "layouts"
+    config.layout = "app"
+    config.paths = "slices/main/templates"
+  end
+end