I just started using nikola. Of course I want to refer from one page (or post) to another, but I could not find out how. After sending an issue, I got great and fast help. And now I know how to do it.
If things are not yet solved in the nikola plugin for orgmode, put this as the end of the
init.el of the plugin:
(org-link-set-parameters "link" :export (lambda (path desc backend) (cond ((eq 'html backend) (format "<a href=\"link:%s\">%s</a>" path (or desc path))))) )
And now you can refer to any page like so
[[link:/bio][My bio page]]