Confusing UI for readonly wiki page paths (BB-3113)

== Feature being used ==
Editing a wiki page - trying to change the path of an existing page.

== Expected behaviour ==
Clicking inside of the path text input, I would be able to change the value and hit save, changing the path at which the wiki page could be found.

== Actual behaviour ==
Text in the input is selectable, but text cannot be added, changed or deleted.

This was confusing enough that I tried several different browsers and restarted my computer before thinking to check the HTML, and sure enough the input has readonly="True".

== Suggestion ==
Either:

• enable page path changes through the web interface (they're possible when working on the wiki source directly, after all)
• don't show readonly fields as an input
• show an explanation / warning that the input contents are non-editable