Use rel="nofollow" in links to bad journals, metrics, etc

[jezcope]

I'm not 100% sure on this, but I think the links to predatory sites should include a rel="nofollow" attribute to indicate to search engine crawlers that the link should not be considered an endorsement. Without this, each link we include here will make a small contribution to improving the predatory site's search engine ranking, which is probably not something we want!

For info see e.g. https://developer.mozilla.org/en-US/docs/Web/HTML/Attributes/rel#attr-nofollow