Move URL from table to header for URL show
Move URL from table to header for URL show

Similarly to what I recently did on the snapshot show page, this bit of
content doesn't really need to be in a table. I'm moving it to the
header to simplify the code and design, and to more clearly separate the
concepts on the page.

Change-Id: I6aba0098d2b7198510eebb9af23f0c6ac519921b

kalw/diffux,diffux/diffux,diffux/diffux,diffux/diffux,kalw/diffux,kalw/diffux