Add withdraw link to index view

- Make the title link to the edit page
- Add a link to the show page titled "withdraw" for published documents.
  Currently the only thing you can use the show page for is to withdraw
  documents, so this makes things a little better until we give the show
  page and index page some proper TLC.
Redirect to index view after withdrawing

The show page can only be used to withdraw documents at the moment, so
once the document is withdrawn it makes more sense to be sent to the
index view.