Migrate baterna comments

[aureliojargas]

The course comments (550+) should be on https://aurelio.net/baterna/, but unfortunately they are on http://aurelio.net/blog/2006/10/20/baterna-curso-de-bateria-online-e-gratuito/.

Disqus has a migration tool via CSV which I can upload the URL mapping. See https://help.disqus.com/customer/en/portal/articles/912757-url-mapper

• [ ] Turn on comments on /baterna
• [ ] In /baterna contents, remove the links to the blog post
• [ ] Migrate the URLs in Disqus CSV
• [ ] Wait for the migration to complete
• [ ] Close the comments on the blog post
• [ ] Rework the blog post text since now there are no comments there
• [ ] Rework the course text to acknowledge that now the comments are here