Move votes partials to components

We're going to change the code quite a bit, and with components we can
easily extract methods when necessary.

app/components/comments/votes_component.rb

@@ -0,0 +1,8 @@
+class Comments::VotesComponent < ApplicationComponent
+  attr_reader :comment
+  delegate :user_signed_in?, :can?, :link_to_signin, :link_to_signup, to: :helpers
+
+  def initialize(comment)
+    @comment = comment
+  end
+end