Change permissions on archive page.

- If an archive is deleted, you see one message if you deleted it and another message if someone else did.
- If an archive is in the darchive:
  - All users see the same thing for live view.
  - For archive view, vesting+ users see a message along with the archive, and non-vesting users see a "contact a participating librarian" message. 
  - I commented out the "in the dark archive because ..." message, because it's not accurate yet -- it reports a takedown request no matter why we darchive something.

HTML cleanup: remove some redundant <div class="row"> tags, and the layout-archive-responsive template that was confusing things.