comments: refactor to use ViewComponent.

app/helpers/comments_helper.rb

@@ -0,0 +1,10 @@
+module CommentsHelper
+  def render_comment(comment, **options)
+    render CommentComponent.new(comment: comment, **options)
+  end
+
+  def render_comment_list(comments, **options)
+    dtext_data = DText.preprocess(comments.map(&:body))
+    render CommentComponent.with_collection(comments, dtext_data: dtext_data, **options)
+  end
+end