@glitchfool and others - Just in the interest of honesty and advising caution, I have to say that some of the Fiverr editors have either been given different instructions or I have misunderstood the Support article that @annai80 referenced.
The way I read the article, sellers should technically be able to put any URL listed in that article inside their profile AND/OR gig description. I am going to say, though, that I had a different experience on it and I decided it was easier to accept the situation than to try to argue it. This was just me, so if this happens to you, go with your own gut. I have a blogspot portfolio that is listed in my profile. At one time I listed in in my gig description as well. My gig was flagged by the editors and I was asked to remove it from the description and list it only in the profile. So, its no longer in my description.
I am assuming this is just a miscommunication somewhere, but I didn’t want to let this thread go by without saying what happened to me. I have seen people list their links in their FAQs without issue, although I don’t know if that is really covered. I’m not advising anyone not to list their approved URL’s in descriptions, I just want you to be aware that you might be asked to take it back out. It might not hurt to contact CS first and ask them directly. I hope my own experience was a one-time thing. Good luck!