Refactor app in to its own slice

slices/main/actions/blogroll/opml.rb

@@ -0,0 +1,16 @@
+require "time_math"
+
+module Main
+  module Actions
+    module Blogroll
+      class Opml < Action
+        include Deps["views.blogroll.opml"]
+
+        def handle(req, res)
+          res.content_type = "text/xml; charset=utf-8"
+          res.render opml, format: :xml
+        end
+      end
+    end
+  end
+end