Promote "Permalink"

[mbrodala]

The link reference modal in the docs currently has "URL" and "Permalink":

It should be considered to skip/hide the "URL" if a "Permalink" exists.

If both are kept, the "Permalink" should at least be moved to the top.

This makes it more likely that people use the "Permalink" and thus have reliable, stable URLs.

[garvinhicking]

Sounds good to me, yes!