Hi there!
No, you can’t put hyperlinks in your profile (you can’t get suspended, it simply won’t let you publish your listing with a hyperlink present). Even if you could, I don’t think many sitters would really take the time to click external links for further reading anyway, as most sitters apply for multiple listings at once. Just save the links for your welcome guide or folder of notes that you leave for your sitter. It’s best to just briefly list some top tourist attractions in your listing - most sitters do their own research of things they’re interested in anyway! Remember that your listing should be a basic overview & advert.
If you’re seeking any further guidance with your listing, here’s a post I recently wrote to support pet parents with their listing!
Hope that helps and welcome to THS! 