I have a blog site that I developed using the Symfony framework. I am adding the articles with CK Editor. Some authors on my site have added links to their articles, and these links also have 404 errors. What I want to do is add rel="nofollow" to the <a> tags of links that have been added in the past and will be added in the future, but I can't figure out how to do that.
I tried adding rel="nofollow" to these pages later with javascript but this is not the solution. Because javascript files are loaded last and that doesn't make sense.